This is the Hobby Products International (HPI) M Compound Radial Tires Wide (31mm) Width for Touring Cars and Sedans. FEATURES: Radial Tread and Medium "M" Compound Fits Touring type cars from Kyosho, Tamiya, Yokomo and the HPI RS4 using standard width wheels Fits Wide (31mm) Width Wheels YOU WILL RECEIVE: Two Radial M Compound Wide Tires Two Grey Foam Insert Strips SPECIFICATIONS: Outside Diamter: 2-9/16" (2.5") (65mm) Inside Diamter: 1-15/16" (1.9") (49mm) Width: 1-3/16" (1.2") (31mm) REQUIREMENTS: Glueing Tires to Wheels with CA Glue Such as GPMR6001. Glueing the Foam Insert Strip with Contact Cement 31mm Width Wheels . COMMENTS: Writing on the sidewall says "HPI and Japan" on both sides. Other versions available: