Beaducation Basketball Metal Design Stamp, 5.5mm Sports Punch Stamping Tool Hand Stamped DIY Jewelry Crafts Original Metal Design Stamps Basketball Design Stamp - Beaducation Original Design measures: 5.5mm wide by 5.5mm high. Made from 1/4" square heat-treated tool steel. Made in the USA. Made to stamp on typical jewelry making soft metals, such as sterling, gold filled, copper, brass, pewter etc. Do not use on stainless steel.