... ,clothes buttonsMaterialzinc alloy, bronze, brass, aluminum, etc.Size13-16mmDesignround,quadratic (As your request), Supply free design service according to your logos ... .2)Free design service (professional designers).3)No MOQ limited.4)Mould charge is refundable when the quantity of custom medal ... cooperate with you. zinc alloy buttons,clothes buttons,jeans button, four holes button