These are the 4 piston/pot M Performance brake calipers which are 370/380mm. Fitting models such as the BMW. M135i, M140i, M235i, M240i, 320i, 335i, 340i, 435i, 440i. To fit these onto the above models, including the E series you'll need 370mm F30 340i brake discs & pads. In fair condition as shown.Bleed nipples have been checked, all are free and moving, along with the pistons which have been checked.