The Roto Cork used in cold apply waxing for generating a very high friction-based heat for applying top coat blocks. The MasterWax Roto Cork is true and thick for long-lasting and consistent waxing. It will work on any standard 12cm, 6mm hex roto handle. The MasterWax system doubles up with a wool application by slippping a wool applicator (sold seperately) over this cork giving you a Roto Wool as well. This cork, the roto handle, a wool applicator, and a block of cold-apply wax and you`ll be ready to race with MasterWax!