Beaducation Om Metal Design Stamp, 5mm Mantra Hinduism Tibetan Buddhism Yoga Meditation Punch Stamping Tool for Hand Stamped DIY Jewelry Crafts Original Metal Design Stamps Om Metal Design Stamp - Beaducation Original Design measures 5mm wide by 4.5mm high. Made from 1/4" round 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.