Review on Schrader 20055 TPMS Nickel Plated Valve Core - Pack of 100: Premium Quality for Optimal Tire Pressure Monitoring Systems (TPMS) by Randy Brimmer

Basically I have a bike shop in my garage and all my friends and neighbors work so this was a must. Not much to say, I had no problems and I probably used 25 out of 100. The biggest thing I use them for is replacing slime sacrifices - if you don't get it right when deflating and there's too much slime in the stick, it clogs these things up uselessly. They seem to be well made - I didn't count them but it looks like there are a hundred of them and I think they arrived on time. If you need valve cores, just buy them in bulk, they will last a long time.