These Duratrax® PIVOT front and rear tires are Class 1 (4.19” outer diameter) size for maximum scale appearance, with a 1.9” inner tire/outer wheel diameter. Made from super-soft C3 compound rubber with an aggressive tread that bites into loose or muddy surfaces, these tires provide exceptional gripping power for climbing over slippery rocks and getting past the toughest obstacles. They include foam inserts and arrive factory-mounted to 12mm hex wheels that are molded from a durable black composite plastic. Sold in pairs.