A replacement matte black resin band suited to the G-Shock GSTS100G model. The Casio product code for this item is 10502763.
This is the genuine band only, which is the original for:
GST210B-1A
GST210B-1A9
GST210B-4A
GST400G-1A9
GST410-1A
GSTS100G-1A
GSTS110-1A
It can also be fitted to other G-Shock watches within the range with the following case numbers:
GST210
GST400G
GST410
GSTS100
GSTS110