Brembo F8X M2 / M3 / M4 GT-S Big Brake Kit - 380x28mm 2-Piece RearProduct Description: (R) 4 Piston Cast Monobloc Calipers 380x28mm (15") 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