They are the Kuhmo 4.3x1.7-2.2/3.0" Tires from Traxxas. Features: Rubber construction twice profile Foam inserts Includes: Two dual Profile 4.3x1.7-2.2/3.0" Kuhmo Tires Two Foam Inserts Specs: Outer Diameter: 110mm (4.3") Internal Diameter: 56mm/76mm (2.2"/3.0") Width: 43mm (1.7")