Quick-Silver FNSL4R four piston calipers add the option of the new nickel finish to the most popular calipers used in our rear Big Brake kit line. These smaller volume 4 piston calipers provide matched rear brake bias when using six piston or large four piston front calipers. Forged narrow Superlite calipers integrate "Big Brake" style with Wilwood's latest technology to generate big stopping power over a broad range of vehicle applications. Stainless steel pistons, high-temp seals, SRS bridge plates, and two-piece bleed screw assemblies are standard in all calipers. Three high performance street, and four high-temp race only brake pad compounds in the 7416 pad type, allow precise tuning of the brake response, friction requirements and temperature range for all types of high performance and competition applications.