Silicone Rubber Tire Inserts Foam Fit 1.9" Tires For 1/10 RC Crawler Axial SCX10
Red and Blue Inserts: Hard for approx 8KG RC Crawler. Purple and Green Inserts: Soft for approx 2-4KG RC Crawler. Tires Inserts made of silicone rubber material is waterproof and high temperature resistant.