This is a 58mm Narrow Tire Set from the Educational Construction Series by Tamiya. FEATURES: Hard black simulated rubber tires on grey plastic wheels. Includes two tires and wheels. Compatible with hex or round shaft output. Includes screws, nuts and bolts. Detailed pictorial instructions. INCLUDES: Two 58mm Narrow Tires. REQUIRES: Assembly Phillips Screwdriver Side Cutters Hobby Knife Adult Supervision SPECS: Diameter: 58mm (2.28") Width: 16mm (.63") COMMENTS: These tires are not for R/C vehicles. Keep away from children under 3 years of age due to choking hazards. sdw 4/25/01 ir/jl