This is a pair of Pro-line Velocity 2.2 12mm Hex Rear Wheels in Yellow for the Associated B4 and B4.1 and the Kyosho RB5. FEATURES: Constructed of nylon, ultra lightweight design Reversed dish design protects the nut and axle from damage during collisions INCLUDES: Two Pro-line Velocity 2.2 12mm Hex Rear Wheels SPECS: Width: 1.5" (38mm) Diameter: 2.2" (56mm) Hex Size: 12mm COMMENTS: To use with the Associated B4 and B4.1, the 12mm Rear Hex Conversions (PROC7700) must be used jxs 02/01/12 ir/jxs