These are the 1/10 scale Caliber 2.2" M4 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 for extraordinary performance 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 YOU WILL RECEIVE: Two 1/10 scale Caliber M4 Off-Road Rear Truck Tires with Inserts REQUIREMENTS: Two Standard 1/10 scale Wheels Tire Glue DTXR2000, DTXR2002 SPECIFICATIONS: Outer Diameter: 4.00" (102mm) Inner Diameter: 2.2" (80mm (3") Width: 2.08" (55.88mm)