Made of Stainless Steel. Little pressure is needed to stamp precious metals, including white gold. Can be used on curved or flat surfaces and stamps inside rings as small as size 4. Easy to use, requires no set-up and no hammering. Made of durable stainless steel with adjustable screw to lock stamp in place. Overall length is 51/2". Punches not included. If you have any questions please give us a call (800)355-2956.