Shell bracelets are a common ornament of the Korean Neolithic period, found mostly at sites in the northeastern and southern coastal regions. The shells come from various types of clams, with the most common species being Glycymeris albolineata. Most shell bracelets are oval rings, made by cutting off the raised dome of the clamshell to create a hole about 4 to 7 cm in diameter, and then grinding the cut edges. Shell bracelets have been excavated from many Neolithic sites, such as the Dongsam-dong shell midden in Busan. Also, the remains of a woman wearing four bracelets were found at the Ando shell midden in Yeosu.