Yosoo-164-0.6 Round Rubber O-Ring Set for Wristwatch Black

I don't need 950 pieces of these O-rings in all these different sizes, I don't even need 50 of the 30mm. I only need 5-6 pieces of 30mm to last me a life time of my Seiko watch, because a watch battery will last 2-3 years and we just need to replace the O-ring when it is broken during battery replacement. However, a shop will charge me $25 to replace the O-ring and a repair dude in the mall small kiosk will charge me $15 for one replacement. I may as well just get the whole set for less than half of the shop charges me. Now I have many extra in different sizes and i don't need to worry about where to buy the O-ring for all of my watches for life. And the most important thing is my 10-year-old Seiko is back to waterproof again. No more water vapor under the glass.

I wasn't able to use these pieces because they were too small for my large watch face, so I can't speak to their durability or anything else about them except their numbers. For a more standard size watch, there would be a lot of variety - a total of 950 gaskets, 19 sizes from 12-30mm, 50 pieces per size.

This review is for the Yosoo 950pcs O Ring Watch Back Gasket Rubber Seal Washers Set Watch Gaskets kit Replacement O-rings for Watch Backs Size 12-30mm, 0.6mm.I had 6 watches or so collecting dust for years which I just never felt like having the batteries changed on since the average cost was $15 a watch to have it done, plus they try to sucker you for extra money if you want the gasket replaced. Two of my watches were "Fossil Big Tic" watches so that supposedly commanded even more money since they said they needed a "special tool" ; that's in addition to the cost of extra batteries since they take 3 each.Well, I bought all of the tools I needed and still wound up spending less money than I would have if I paid a jeweler or watch kiosk for replacing my batteries. The one thing you do NOT want to overlook is the gasket. They do get dried out over time, and if you don't replace it you're asking for your watch to get fogged up or even damaged if you get it wet.I had no idea what gaskets I needed since I have no idea what sizes exist, or what's inside the watches. I figured I couldn't go wrong purchasing a variety pack. For me, this variety back had every single size available I needed except for one of my watches. I'm not sure what diameter it is, but one watch has a gasket larger than 30mm and unfortunately 30mm is the largest gasket this variety pack contains. I had to keep the original gasket in that watch, I'll have to make a mental note not to get that one wet.I don't have anything bad to say about these gaskets, they just work! I just wish they had some of the larger sizes in the package as well. I have one watch left to open, and when the tool arrives for that one these gaskets will be ready...

Can't go wrong. Putting a watch back together without a new gasket is an invitation to disaster. These gaskets cost (on a statistical basis) NOTHING per gasket, they work great, and having this huge collection for less money than a fast-food lunch is absolutely a no-brainer. BTW, worrying about 23mm vs 24mm is needless--you just have to be in the right ballpark, exact measurements are not important for watch gaskets. Use one that appears to be in the ballpark, in terms of size. No biggie! Buy a pack of these watch-back gaskets and you are covered for LIFE. Buy the big pack and never give it another thought!

I liked the fact they came in all sizes.

For the standard original Navy Seal Luminox, I am skeptical. The .6mm diameter is smaller than the OEM. The o rings do not lay perfectly round and would need to be slightly heated while on a mandrel of sorts to make them be perfectly round. The 30mm is approximately the correct size but you can't tell when you are trying to get the misshapen o ring to stay in the watch grooves. When you put the back on heavens knows whether the o ring stays in place. I have to wear the watch now it see if this will keep out moisture but I would not bet it will. Too small in diameter to start with.

My kids will inherit these, lol.

I was reluctant to order this as the largest one was 30mm. I measured that I needed at least 32mm. I used the 30mm one and it fit with no problem. Actually could not even notice that it had to stretch. Gave it a very light coat of silicone grease too.