Beaducation Football Metal Design Stamp, 6mm Sports Punch Stamping Tool Hand Stamped DIY Jewelry Crafts Original Metal Design Stamps Football Design Stamp - Beaducation Original Design measures: 6mm wide by 4.5mm high. Made from 1/4" square heat-treated tool steel. Beaducation Original Design. 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.