Specifications: Piston diameter: 1.2 inches (30 mm) / 1.3 inches (34 mm) / Material: Aluminum (2 piece cast) / Weight: Approx. 2.6 oz (970 g) / Surface treatment: Gold / Piston material: Aluminum; Mounting pitch: 2.6 inches (65 mm) / Pad spring tweezers set 122.4849.56 inches (spare pads) Item) 107 .7855.10 Pad (for Z01 racing) 107.7855.11