Jesse Uresti Designs: "JUD" European, F1 inspired Race Wheels. 30% Carbon Fiber Reinforced, Mesh Spoked, 2 piece: light weight *Flange Rings. Strong, true, Acetone safe, FULL, RACE WHEELS. Includes: (2) Threaded, Spin on/Off, Laser etched Flange Rings. *Flange Rings in different diameters control tire sidewall flex & movement often associated with "traction rolls" twitchyness, and consistencies on the track. Using this wheel with the included spin on flange rings will immediately improve your driving experience on RCP tracks. The NXUSA-416, 7 piece or the NXUSA-428, 10, available separately, piece Flange ring pack will allow for hundreds of combinations of performance. If you are not using these, you don't know what you are missing!