Brembo E9X M3 / E82 1M GT-R Big Brake Kit - 380x28mm 2-Piece RearProduct Description: (R) 4 Piston Billet Monobloc Calipers 380x28mm (15'') 2 Piece Discs Complete Axle Set Pre Assembled All Necessary Hardware Included INTENDED USE Street Track Race ___ ___ ___ ___ ___ CALIPER Body: Billet Monobloc Radial Mount Piston Configuration: 4 Piston Piston Design And Insert Type: Inner Pressure Seal Recessed Dust Boot Ventilated Stainless Steel Insert DISC Type: Cross Drilled, Type 1 Slotted, or Type 3 Slotted Material