They are manufactured using high performance components.
It is specifically manufactured for durable wear resistance, cool running, high heat and oil resistance, flexibility, and has been proven by thousands of hours of customer use. 120" Outside Length, 1/2" Top Width, 1 Ribs DURA-EXTREME CLASSICAL belts are single, raw edge, cogged belts that give extreme belt performance. The lower compression section is made of fiber reinforced synthetic rubber compound.