Our Relentless® blades are manufactured in Switzerland from the highest quality steel on the most modern equipment. The result is a blade with flexibility and an unexcelled edge for cutting gold, silver and other metals. Relentless® blades are extra long lasting because they are electronically tempered and are easier to use because they don't wander. Teeth are perfectly angled, uniform and straight. We chose Relentless® "Golden Extras" because they are state-of-the-art to meet all of your cutting requirements. Cut is 5/0; 144 blades included.