These inlaid brass bracelets are just a few 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 bracelets measure: 2 5/8 x 2 1/8" (6.7 x 5.4 cm) with a 1 3/16" (3 cm) opening. The interior dimensions are 2 7/16 x 1 3/4" (6.2 x 4.4 cm)