Exactly what I needed.

Ive gone through a lot of valve stems in my time using tubeless tires. These are by far the best-built Ive seen - a bit more substantial than other brands Ive used. They also have removable cores, which is huge for those of us adding sealant without wanting to pop the tire bead off. Im going to see if they have a 60mm length version for use with more aero-style rims.

Quality was good and conveniently came with the core tool. My only problem was that the valve stems wouldnt seat completely when installed (WTB i19 wheels) as they were slightly too wide and the rubber too hard make an airtight seal, even when the nut was tightened with pliers.

Easy to install, sealed quickly, no leaks, and nice additional little tool.

I think these 40mm Presta valves are the perfect length for my MTB. Ive tried other valves that were 46mm and they were longer than necessary. I like that these valves are made of brass and not aluminum because of the added durability of the threads. I use a rubber grommet instead of the o-ring because I feel that when its compressed down it gives a more complete seal. I really like the shape of the locking nut on these valves because it holds the grommet in place nicely. I also like the silver color on these valves instead of the brass colored valves because they match my bike components better. I dont use the plastic valve core remover that comes with these because I have valve caps with the valve core remover made into them.

Product is great, as expected

Works great seals well onto the rim.

Just what I was looking for and fast delivery.

Its cheap and it worked!

Easy set up, good product for the buck