This is the optional Integy 57 Tooth Steel Spur Gear for Traxxas T-Maxx 3.3 and Jato models. FEATURES: Steel construction Color coded aluminum ring for easy tooth number identification (the 57 tooth features a red colored ring) INCLUDES: One steel spur gear with red aluminum id ring REQUIRES: Installation SPECS: Thickness: .24" (6mm) COMMENTS: For the 53 tooth gear order INTC1273 For the 55 tooth gear order INTC1274 For the 56 tooth gear order INTC1275 For the 58 tooth gear order INTC1277 kpm11/21/2006 ir/jxs