This genuine Miele Belt is for the SEB 213, SEB 213-2, SEB 217, SEB 217-2 and SEB 217-3 Powerbrushes plus STB 205 STB 205-2, and STB 205-3 Turbobrushes. The cog design provides positive power transfer from the motor or turbine to the brush roll. It can not stretch and slip. This reinforced cog type belt is packaged and sold individually. They typically will last three to five or more years.