... 4) Size:many size available 5) Shape:ball style with shank Natural material, ECO-friendly . Shape Agoya Shell Button . ... ), Mussel, Paua, River, Trocas, Trocas, TrochusButtons StylesHoles, Self-shank, Brass eyelets, Laser logosProduction ProcessSelecting, Embryo Extracting, Grinding, Perforating, ... (French);Thickness1.5mm to 4.5mm thick; self-shank trocas or white MOP shell buttons, the thickness may ...