Hella Grip is a silicon-carbide grit formula that provides great traction but won’t wear out shoes. It features High-strength, waterproof, tear-proof PVC liner that cuts easily but won’t wear out. There is an aggressive adhesive that won’t degrade with cold or hot conditions. Silicon Carbide occurs in nature as the extremely rare mineral moissanite. The cheaper alternative that is used in the industry is Aluminum Oxide. Hella does not incorporate this alternative chemical compound in our formula due to its substandard quality. 9" x 33".