Brembo E9X M3 / E82 1M GT-S Big Brake Kit - 345x28mm 2-Piece RearProduct Description: (R) 4 Piston Cast Monobloc Calipers 345x28mm (13. 6'') 2 Piece Discs Complete Axle Set Pre Assembled All Necessary Hardware Included INTENDED USE Street Track Race ___ ___ ___ ___ ___ CALIPER Body: Cast Monobloc Radial Mount Piston Configuration: 4 Piston Piston Design And Insert Type: Inner Pressure Seal Recessed Dust Boot Stainless Steel Insert DISC Type: Cross Drilled, Type 1 Slotted, or Type 3 Slotted Material Finish: Advanced