Nexxracing's: "JUD" EVO Flange Ring Pack. 1 Pair of each. 21.4, 21.6, 21.8, 22.0, 22.2, 22.4, 22.6, 22.8, 23.0, and 23.2 mm diameters! These revolutionary, screw-on side wall covers will make any car faster, smoother and way more consistent than any other wheels and never fall or pop off. Used with the threaded NXUSA-EVO Carbon reinforced Wheels! High-Tech, "Lock on" variable angled sidewall covers, "Flange Rings" cover the tire's sidewall and effectively, controls scrub, bite and lift of the sidewall resulting in remarkable and consistent higher speeds all over the track. (10) descending diameter Flange Rings Sets are provided to handle tire wear and changing track conditions. Built for racers, by racers, engineers, enthusiast. NX-EVO-Tool makes it effortless to install and remove. Get some!