Amplitube T320-2N Polypropylene PCR Reaction Tube Strip with Attached Flat Cap, 8 x 0.2ml, Natural (Pack of 125)

The product I received does not have attached caps. It has strips of tubes, and separate strips of caps in the same bag. I returned, because I've had back luck with this type of product in the past.

The caps are not tight at all and they can't keep the liquid in the tubes, especially when you try to spin the strips.