These "etched" and inlaid wide brass bracelets are some of the many versions of the bracelets that Tuareg people still make and use themselves. They say the inlays are "ebony" but I sincerely doubt that, and can't say what that black inlay really is. Perhaps traditionally they were ebony.

These are versions of this bracelet of which we only have a single one each.

This bracelet measures: 2 3/4 x 2 1/4" (7 x 5.7 cm) with a 1 3/8" (3.5 cm) opening. The interior dimensions are 2 1/2 x 2" (6.3 x 5 cm)