This is a set of JConcepts Mono Rear Wheels in Yellow with 12mm Hex. for the Team Associated B4.1, B44.1 and the Kyosho RB5 Buggies. FEATURES: Maximum size allowed under ROAR rules Constructed of plastic with slight concave dish shaped design INCLUDES: Four JConcepts Mono Rear Wheels in Yellow with 12mm Hex REQUIRES: #2091 12mm Rear Hex Adapters (JCOC2091) if using on B4.1 #2089 JCOC2077, #2090 JCOC2078, Locking Style Wheel Nuts if using on the Kyosho RB5 SPECS: Width: 1.5" (38mm) Diameter: 2.2" (56mm) Hex Size: 12mm jxs 02/03/12 ir/jxs