These are the 1/10 scale Caliber 2.2" M3 Off-Road Rear Truck Tires from Pro-Line. FEATURES: Softer compound than M3 for use when greater traction is needed Dual-stage pin design for exceptional tread life Small top pin for light to heavy loose dirt Base pin extraordinary on hard-packed/blue-groove surfaces Square-lug technology throughout the tread design Directional tread for two different handling characteristics Internal carcass ribbing for reduced tire expansion under acceleration INCLUDES: Two 1/10 scale Caliber M3 Off-Road Rear Truck Tires with Inserts REQUIRES: Two Standard 1/10 scale Wheels SPECS: Outer Diameter: 4.00" (102mm) Inner Diameter: 2.2" (80mm (3") Width: 2.08" (55.88mm) lmm 03.03.10 ir/jxs