Gator's lightweight Polyethylene shock racks are built for maximum protection and ultimate functionality. Gator Shock Racks are molded from incredibly durable high-density military grade Polyethylene.The shock rack is specially designed to allow 360 degree air ventilation around equipment to keep your audio gear pristine and longer lasting. Gator Shock Racks feature adjustable interior sliding support on each side of the rack. It adjusts front to back and up and down for rear support of audio gear to eliminate shifting and jostling. Recessed side handles give your hands a break while the locking lid gives you peace of mind.