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Baer SS4+ Deep Stage Drag Race disc brake kits feature the S4 4-piston calipers, each mounted to a 2-piece slotted, drilled, zinc plated rotor. The SS4+ kits are designed like Baer's larger systems, but in a smaller package to fit 15 in. wheels and larger. These Baer drag race disc brake systems are specifically designed for heavy, fast cars that might see a bit of street use. The rotors are directionally vented, and the calipers have dust seals.