This is a speidel 16mm rubber band.  Fits to Casio Models:DW5300, DW56RTB,DW5600E, DW5900,DW6000, DW6100,DW6200, DW6500, DW6600, DW6695,DW6700,DW6800,DW6900,DW6900FS,DW8700,G100  watches.