IMS Competition Series Filter Basket for La San Marco, Dalla Corte, Izzo. Fits 18-20g of coffee. BORDER: Ø 66 mm, HEIGHT: 32 mm, BODY: Ø 56 mm for Ø 54 mm tamper. Ridgeless. 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. PERFORATED AREA: Ø 44 mm. NUMBER OF HOLES: 641 Micro spacing. 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. ELECTROPOLISHING: smooth surface with unmatched sanitary and non-contaminating qualities is obtained. Compatible with Dalla Corte, Izzo, La San Marco