Brembo E36 M3 Pista Big Brake Kit - 328x28mm 2-Piece RearProduct Description: (F) 4 Piston Forged 2 Piece Calipers 328x28mm x54a (12. 9") 2 Piece Discs Complete Rear Axle Set Pre Assembled All Necessary Hardware Included INTENDED USE Street Track Race ___ ___ ___ ___ ___ CALIPER Body: Forged 2 Piece Piston Configuration: 4 Piston Piston Design And Insert Type: Inner Pressure Seal Stainless Steel Insert DISC Type: Type 3 Slotted Semi Float, Type 3 Slotted Full Float, Type 3 Slotted Zinc Disc Material Finish: