These rare Revell tires were originally designed for the Revell "plastic" RTR cars produced from 1967 to 1970. They are ribbed tires with a diameter of 13/16" and are 3/8" wire and fit a rim of 3/8" to 7/16" diameter. They have a bit of webbing from the molding process, but the extra rubber pulls right off the tire without the ned for a special tool.