Nike Apple Watch Sport band in black size S/M. Gently used - no functional flaws. Unisex. This band does not say the exact size on it and I am unsure what watch size it is for but it should be in the 40-41mm range (see photo compared to the 38mm band - I do not know exact measurement). Per Apple’s website: You can match most bands with any Apple Watch Series 3 or newer case of the same size. The 41mm bands work with 38mm and 40mm cases.