Porterfield Brake Shoes for 1998 GMC SUBURBAN 2500 2WD 13 x 2 1/2" Rear Shoe Compound:R4-S Q: What material are these

Q: What material are these protection covers made from

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Porterfield Brake Shoes for 1998 GMC SUBURBAN 2500 2WD 13 x 2 1/2" Rear Shoe Compound:R4-S Q: What material are thesePorterfield Brake Shoes for 1998 GMC SUBURBAN 2500 2WD 13 x 2 1 2" Rear Shoe Porterfield R4 Porterfield R4 Carbon Kevlar based brake pads were fully designed for heavy duty extreme motorsports use. Its one of the the few true motorsports competition pads available on the market today. The carbon based semi metallic R4 brake material allows the brake pad to absorb huge amounts of heat and dissipate it quickly and evenly over time. The Carbon Kevlar