CMB 0057 Details Compbrakes Pro-race 4 Billet Calipers are 4 piston and light weight. Used on many race cars Lotus Elises etc. which have performed outstanding. Housing material billet aluminium 7075T6. Hard anodised in titanium/black/silver to 50 microns Radial mounting centres 120mm Side/bottom entry feeding ports Pistons stainless steel / titanium 1.375" x 1.375" Disc Thickness range 12-30mm Suitable for 225.5mm to 330mm rotors Weight 3.19lbs (1450g) Compbrake .