RISO INK GR 3750 RED BLACK BLUE HUNTER GREEN AND 1 MASTER BRAND NEW Print shop owner retiring May also be compatible with Models GR, RC, RA, FR, RP, & RN 3700 3750 3790, FOR RC-5800, RC-5900, RC-6300, FR-2950, FR-3910, F, FOR RP3500, RP3505, GR-1700, GR-2700, GR-2710, GR- s 1