Natural horn buttons, approximately 10mm across and 2mm thick. (Matching 12.5mm buttons shown in the 2nd photo are available separately.) These are a "dirty" beige colour overall, with a few darker taupe markings. They are convex on the back and concave on the front. The backs are more polished than the fronts, which look semi-matte.
I take care to pick the best available buttons for each order but, since horn is a natural material, there may be slight imperfections and variations in colour. Please wash with care - avoid using acidic cleaners and high heat.