Genuine Casio replacement resin band in black.
 
Made for the following model(s):
HDA-600-1BV
HDA-600-1BVU
HDA-600-7BV
HDA-600-7BVU
HDA-600-9BV
HDA-600-9BVU
HDA-600B-1BV
HDA-600B-7BV