FEATURES SHAPE: BORDER: Ø 68 mm (B68) HEIGHT: 24.5 mm (H24.5) BODY: Ø 60 mm for Ø 58 mm tamper RIDGE: ridgeless SHAPE: Cylindrical with specific corner rounding TAMPER: Accepts a 58 mm tamper base The shape was created by I.M.S. to obtain the proper ratio between the base and height of the coffee puck in relation to capacity. The filter is cylindrical with a specific corner rounding at the base. This shape has been designed to exploit the whole coffee puck, which also facilitates drying and expulsion. PERFORATION I.M.S. perforation is exclusive and patented PERFORATED AREA: Ø 44 mm area optimized in relation to the shape of the filter. NUMBER OF HOLES: 641 Micro spacing (M) The number and distribution of the holes are designed to balance the delivery in relation to the height and shape of the filter and perforated area. HOLE DIAMETER: 0.30 mm SHAPE OF THE HOLE: CIRCULAR with CONICAL cross section. COMPETITION PERFORATION: Relaminated and Recalibrated. FINISHING TUMBLING: Wet vibrofinishing with ceramic inserts and drying with corncob PICKLING: Passivation and preparing of the material ELECTROPOLISHING: smooth surface with unmatched sanitary and non-contaminating qualities is obtained. COMPATIBILITY La Cimbali Carimali Gaggia Product specifications and more details here