GR Master for use in RISO duplicator At least 1500 pcs ... a supplier of Fax ribbon and Thermal transfer ribbon. Model: GR Master- B4400dpi master, high quality and resonable price.a) Dimensions ... .5mmc) Applicable duplicator models: GR1700, GR1710, GR1750, GR2700, GR2710, GR2750 GR Master