Genuine Casio replacement rubber packing/o-ring in black. 
 
Made for the following  model(s):
G-2110-1V, DW-5300G-9VZ, DW-5300G-9V, AD-301-1EVMQ, DW-5300G-9VUZ, AD-301B-2EVMQ, DW-5300G-9CVUZ, DW-5000D-8V, DW-5000SL-1, DW-5030C-1, DW-5300G-9CV, DW-5000ML-1, DW-5000LV-7, DW-5030-1, DW-5000SP-1, DW-5025D-8, DW-5025B-7, DW-5300-1CVUZ, DW-5300-1AVZ, DW-5300-1AV, DW-5030D-1, DW-5300-1BV, DW-5300-1CV, DW-5300-1BVZ, DW-5300-1BVUZ, G-2300GR-3, G-2310BC-1, G-2300GM-9, EF-109D-4AV, G-2300EB-7, G-2300F-4, EF-109D-2AV, DW-6400C-1V, DW-5725B-7, DW-5700D-8V, DW-5700ML-1, EF-110D-8AV, G-2110-3V, G-2100WC-7V, G-2300DM-9, G-2310B-1V, EF-109D-8AV, G-2300RE-9, G-2100WC-6V, G-2110-2V, G-2100WC-2V, EF-305-1AV, EF-305-9AV, G-2110B-1V, G-2110M-8V, G-2310AK-7, G-2110B-2V, G-2110LV-7, G-2300DM-4, G-2110FL-8S, G-2110CG-8, G-2300-9V, G-2310-2, G-2300DM-2, G-2300-1V, G-2111-1V, G-2110V-1V, G-2110V-8V, G-2310-1, G-2300B-1V, G-2300B-2V, G-2301BC-1, G-2400-2V, GW-2310BD-1, GL-210-1, GL-210-5, G-7000-1V, G-2310GH-8, G-2400-1V, G-2310D-8, G-2310HW-2V, G-2310K-2, G-2310R-1, GW-2310-1, GL-201-2A2, GL-260A-1, GL-170-2, GL-170-1, G-7000-2V, G-7000D-8V, G-7000K-2, GL-170-3, GW-2300FP-4, GL-201-2A1, GL-260A-2, GL-170-8, GW-2300F-4, GL-7000RF-1, GL-260A-3, MDV-103D-7AV, MDA-100-1BVZ, MRG-7100BJ-1A, GW-2310FB-1, OC-504L-7AV, MDV-103D-2AV, MRG-7000DJ-1A, MDV-103D-1AV, MDA-100D-1EVZ, MDA-100B-2BVZ, OC-107L-7AV, OC-100D-1AV, OC-500-1AV, OC-100D-2AV, OC-107D-1AV, MTD-1059D-2AV, OC-100D-7AV, MTD-1059D-1AV, OC-100-8AV, OC-106L-1AV, OC-103-2AV, OC-100-1AV, OC-106D-7AV, OC-103D-1AV, OC-504D-1AV, OC-500D-2AV, OC-500D-1AV, GW-2310FB-1B, DW-5035D-1B, DW-5735D-1B, DW-5000MD-1, GW-2310FB-1B4, MTD-330D-1A2V, MTD-330D-1A3V, MTD-330D-1AV, MTD-330L-1A2V, MTD-330L-1A3V, MTD-330L-1AV, DW-5035E-7, DW-5735E-7, GW-2320SF-1B4