These are the Pro-Line 3.8" (40 Series) Slingshot Tires for use on the Front or Rear Stock Traxxas 3.8" Wheels FEATURES: Rubber construction Molded foam inserts YOU WILL RECEIVE: Two 3.8" Slingshot All Terrain Truck Tires with foam inserts REQUIREMENTS: Wheels Tire glue (DTXR2000/Thin) or (DTXR2002/Medium) SPECIFICATIONS: Outer Diameter: 6.13" (156mm) Width: 3.32" (84mm) jml 05.26.11 ir/jxs &