Explanatory notes
… used for making buttons, studs, etc., are base metals, wood, corozo, dom, bone, horn, plastics, ceramics, glass, … snap‑fasteners and press‑studs . These consist of two or more parts, and operate by means of a snap mechanism. … other. (iii) Blanks of mother‑of‑pearl, corozo, wood, etc., worked (e.g., rounded or hollowed out on one or both sides …