Genuine Casio replacement rubber packing/o-ring in black. 
 
Made for the following model(s):
EQB-900TR-2A, EQB-900D-1A, EQB-900DB-2A,
 
EQW-A1200DB-1A, EQW-A1200D-1A, EQW-A1200B-1A, EQW-A1200RB-1A, EQW-A1200DC-1A, EQW-A1200RP-1A, EQW-A1200D-2A,
 
ERA-200RB-1A, ERA-200RBP-1A, ERA-200DB-1AV, ERA-200B-1AV, ERA-200D-1AV, ERA-500L-1A, ERA-500D-1A, ERA-500DB-1A,
 
GST-W130L-1A, GST-W110D-1A9, GST-S130L-1A, GST-S130C-1A, GST-S120L-1A, GST-S110BD-1B, GST-410-4A, GST-410-1A, GST-210B-1A9, GST-200RBG-1A, GST-200CP-9A, GST-S110D-2A, GST-W110D-2A, GST-S110D-7A, GST-S110D-1A9, GST-210B-7A, GST-210M-4A, GST-W100G-1B, GST-210M-1A, GST-210B-1A, GST-200CP-2A, GST-210B-4A, GST-S100G-1B, GST-210GD-1A, GST-W120L-1A, GST-W130BD-1A, GST-S120L-1B, GST-S130BD-1A, GST-W120L-1B, GST-W110D-7A, GST-410-9A, GST-400G-1A9, GST-410-2A, GST-W130C-1A, GST-W130BC-1A3, GST-S130BC-1A3, GST-S130BC-1A, GST-W130BC-1A