ring thickness 2 mm - inside ø 50 mm for espresso organization ø forty four mmPART NUMBERMANUFACTURER402-245-010CIMBALI402-245-010FAEMA MANUFACTURERTYPEMODELCIMBALISuperautomatic coffee machineM1, M1 (200705-), M2-BARSYSTEM (2007-), S20, S30, S39-GR2, S39-TE