Jaz Products designed these seats for all types of racing. TURBO provides wraparound lateral support in the shoulder and thigh areas during high-speed cornering to keep you right where you need to be. PRO STOCK seats gives excellent back and lumbar support and feature an integral headrest that allows for 325 degrees of vision. Both have molded-in 5/16 in.-18 threaded inserts and also are compatible with 5-point harnesses. Approx Weight 6kg.