RC4WD Boys Z-W0143 Huntsman Spider 40 Series 3.8 Wheel FEATURES: CNC machined aluminum construction, black in color Fits the RC4WD Burnout 1/4 Scale Axle (Z-A0088) Uses multiple hub/hex system INCLUDES: Two Huntsman Spider 40 Series 3.8 Bead lock Wheels Twelve Black M4x10mm Socket Head Cap Screws REQUIRES: Nothing SPECS: Outer Diameter: 4.0 (101.6mm) Width: 2.54 (64.5mm) Negative Offset: 0.86 (21.9mm) Weight: 12.62oz (358g) per wheel COMMENTS: Hex hubs not included; 12mm Hex, RC4C0914 14mm Hex (Z-S0889) 17mm Hex (Z-S0847) 17mm Revo / Summit Hex (Z-S0432) Tool is (Z-S0964) 19mm Hex