03-16 YAMAHA YZF-R6: Vesrah Racing Sintered Metal Brake Pad (Rear) Vesrah&#174; - Stop the best in the world. An excellent, economical choice for replacing O.E.M. sintered metal brake pads. Pad consists of 50 - 60% copper combined with carbon, ceramic, tin and abrasives. Iron backing plate is plated with copper to make it a stronger bond with the pad friction material.