---
product_id: 234907999
title: "Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc"
brand: "crafter blue"
price: "26051 Ft"
currency: HUF
in_stock: false
reviews_count: 5
url: https://www.desertcart.hu/products/234907999-crafter-blue-cb03-20mm-watch-strap-curved-end-rubber-band
store_origin: HU
region: Hungary
---

# Curved end design for perfect Seiko MM300 fit Includes replacement spring bars for easy install Pure vulcanized rubber for superior strength Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc

**Brand:** crafter blue
**Price:** 26051 Ft
**Availability:** ❌ Out of Stock

## Summary

> ⌚ Elevate your Seiko MM300 game with the ultimate rubber strap upgrade!

## Quick Answers

- **What is this?** Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc by crafter blue
- **How much does it cost?** 26051 Ft with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/234907999-crafter-blue-cb03-20mm-watch-strap-curved-end-rubber-band)

## Best For

- crafter blue enthusiasts

## Why This Product

- Trusted crafter blue brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Comfort Meets Style:** Ergonomically designed thickness (4.5mm to 3.5mm) balances robustness with all-day comfort.
- • **Unmatched Durability:** Crafted from pure vulcanized rubber, resisting oils and acids better than natural rubber for long-lasting wear.
- • **Seamless Compatibility:** Precision curved ends engineered exclusively for Seiko MM300 models, ensuring a flawless, factory-like fit.
- • **Effortless Installation:** Comes with replacement spring bars, so upgrading your strap is quick and hassle-free.
- • **Eco-Conscious & Hypoallergenic:** RoHS-compliant material minimizes allergic reactions, perfect for sensitive skin and mindful consumers.

## Overview

The Crafter Blue CB03 is a premium 20mm curved end rubber watch strap designed specifically for Seiko MM300 MarineMaster models. Made from pure vulcanized rubber, it offers superior durability and resistance to oils and acids, while meeting RoHS standards for safety. With a perfect fit, ergonomic thickness, and included spring bars, it combines comfort, style, and easy installation for the discerning watch enthusiast.

## Description

CRAFTER BLUE CB03 curved end rubber band replacement for Seiko MM300. The rubber band is made of pure vulcanized rubber which has superior strength and more resistant than natural rubber to oils and acids. Material has also met the RoHS requirements and rarely causes severe allergic reaction. It also includes a pair of replacement spring bars for easy installation. Item no. : CB03Brand Name: CRAFTER BLUELug width: 20mmBuckle size: 18mmBuckle Include : No Buckle type / Finish : (Compatible with 18mm Seiko MM300 buckle) Overall Length: 90mm + 55mm (Strap length:145mm / 5.71")Thickness: Approx. 4.5mm - 3.5mmSpring bar hole dia.: 2.50mm Compatible with: MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021 (SLA019J1) and SBDX023 (SLA021J1), SBDX025, SLA023J1Material: NBR RubberColor / Finish: Black, Brown, OrangeLug end style: Curved End

Review: Fantastic strap, very well designed. Extremely comfortable. Fits the MM300 case and clasp perfectly. I love it
Review: Es una buena calidad, tiene buen volumen de extensible, los chinos son más delgados y tienen detalles de rebaba... considero un poco elevado el costo pero si vale la pena.

## Features

- CRAFTER BLUE CB03 20mm curved end watch strap replacement watch band for Seiko MM300
- 20mm rubber watch strap compatible with Seiko MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021 (SLA019J1) and SBDX023 (SLA021J1), SBDX025, SLA023J1
- Lug width: 20mm; Buckle size: 18mm; Note: Buckle is NOT included, please use your original buckle.
- The NBR CRAFTER BLUE rubber strap is made of pure vulcanized rubber which has superior strength and more resistant than natural rubber to oils and acids
- Overall Length: 90mm + 55mm (Strap length:145mm / 5.71"); Thickness: Approx. 4.5mm - 3.5mm; Spring bar hole dia.: 2.50mm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B083DC5PST |
| Customer reviews | 4.0 4.0 out of 5 stars (21) |
| Date First Available  | 10 Jan. 2020 |
| Department  | unisex-adult |
| Item model number  | 4894744650517 |
| Manufacturer  | CRAFTER BLUE |
| Package Dimensions  | 17.7 x 11.1 x 1.2 cm; 35 g |

## Images

![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 1](https://m.media-amazon.com/images/I/31XzyXANieL.jpg)
![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 2](https://m.media-amazon.com/images/I/31agdFAmp7L.jpg)
![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 3](https://m.media-amazon.com/images/I/31f-391QxRL.jpg)
![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 4](https://m.media-amazon.com/images/I/31rOWhYGWKL.jpg)
![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 5](https://m.media-amazon.com/images/I/31zKP5uHMgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by D***E on 22 June 2021*

Fantastic strap, very well designed. Extremely comfortable. Fits the MM300 case and clasp perfectly. I love it

### ⭐⭐⭐⭐⭐ Review
*by A***E on 20 February 2025*

Es una buena calidad, tiene buen volumen de extensible, los chinos son más delgados y tienen detalles de rebaba... considero un poco elevado el costo pero si vale la pena.

### ⭐⭐⭐⭐⭐ Review
*by D***S on 5 April 2022*

Wanted a rubber strap and still utilize Seiko clasp from the OEM bracelet. This thing looks, fits and feels great and easy to install. Need to buy the orange one now!

## Frequently Bought Together

- Crafter Blue CB03 Curved End Watch Band Rubber Strap Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc
- MiLTAT 18mm Wetsuit Ratchet Buckle Diver Extension Clasp, 316L Stainless Steel Brushed

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-01-25*