These are 100% good. Should be.

They leak at the base no matter what you do. After spending hours and hours trying to fit these valves (where other valve types would do), I took time to actually review all these 5 stars reviews and realized they are almost all fake. These valves are garbage. Invest few more bucks and get Stans.

Was getting a leak around the valve stem on a mountain bike. After put this in it fixed the issue. Great product. Need to sell it with larger quantity.

No surprises here. Great price. Valve core was easily removed. Feels good quality. Holds the air like its supposed to. Im happy.

I thought I would save money and purchase a set of these for my Stans ZTR crest rims. I couldnt get these to seal properly without air leaking at the stem. I tried both valves that came in the package and had the same results.

Perfectas para mis ruedas

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.

Good for the price

Was as described and shipped fast

Worked great. Making wheels tubeless isnt for the faint of heart, but these stems worked great.