Tie Down Tow Zone Stainless Steel G5 Trailer Disc Brakes have a large single piston design, ceramic pads, and stainless steel backing plates with venting holes. Their all aluminum calipers shed heat 5x faster than cast iron calipers. Tow Zone G5 Brakes feature a slim design, bi-metal piston, 50% thicker rubber boot for positive and faster piston withdrawal, rotating swivel connector, oil impregnated bronze bushings, one-piece stainless steel bleeder valve with Teflon coating, and a square o-ring with a slant edge. Stainless steel parts will not rust or corrode. GalvX hub finish. 5-Lug Brake replaces 10" Drum Brake, while 6-Lug Brake replaces 12" Drum Brake. Lifetime warranty.