Review on Pair Of Super-Light Alloy Tubeless Valve Stems - Available In Multiple Colors And Sizes by Fred Maki

I ordered the 44 mm version. The valve stem measured 44.8mm from the base of the stem, including rubber stopper, to the shoulder of threaded stem; not including valve core (see photo above). The overall length is slightly longer than what came off my 29" carbon Kappius rims and will work great on my trail bike. I wouldn't want it any longer. Each stem (package included 2) came with a presta valve core installed, screw nut, rubber o-ring on the stem that seats just below the screw nut and plastic valve cap. The screw nut has two flat spots and can be tightened with a 3/8", 9mm, open-ended adjustable wrench or by hand (recommended). The o-ring helps to secure the fit of the screw nut against the rim but is pretty small and won't protect the nut from rubbing on the rim (if that's something you're worried about). A single stem weighed 4g. on my kitchen scale without the plastic cap (see photo).The package arrived quickly and in good condition. This appears to be a great value. I'll update this review if I experience any issues with use.Install Tip: After tightening the nut to secure valve stem into the rim, place a small amount of rubber cement (included with many tire patch kits) around the base of the rubber stopper on the inside of rim -- over tape. Make sure you don't get any inside the valve stem (see photo). This will help to prevent leaks from the base of the stem and is still easy to remove should you need to fix a flat on the trail.