GB Racing precision injection molded 60% long glass fiber reinforced nylon composite supplemental engine protection covers provides ultimate in protection for your machine! The tough long glass fibered nylon is a high impact material that is designed to absorb energy without cracking in most situations. Precision injection molded secondary engine covers add a great layer of protection – and are the choice of top AMA, BSB, and WSBK teams – GB Racing covers are FIM approved.