JConcepts brand package of four JConcepts Inverse B4.1 Front Wheels in Yellow. FEATURES: Fits the Associated B4.1 with the 12mm Hex Conversion Kit Constructed of plastic Inner wheel has black matte finish and smooth inner surface to resist dirt buildup Outer dish interlocks with inner wheel, and with inner screws and interior ribbing, provides tuned rigidity and minimizes wheel flex YOU WILL RECEIVE: Four JConcepts Inverse B4.1 Front Wheels in Yellow with 12mm Hex REQUIRES: Flanged lock-nut or washer to cover the center tab configuration- Blue, JCOC2075 or Black JCOC2076 SPECS: Diameter: 2.2 (56mm) Width: 1 (25.4mm) Hex Size: 12mm jxs 07/25/12 ir/jxs