Crafted from an ultra high strength polymer designed to outwear some metals, nylons, and urethanes. Galvanized hardware prevents rust for a long lifetime. Low friction coefficient and is self-lubricating with a non-adherent surface. 3/8" - 1/2" cable. ULTBRK1.2: Ultrabrake 3/8?ǥ - 1/2?ǥ cable|ULTBRK7.8: Ultrabrake 5/8?ǥ - 7/8?ǥ cable