NinjaCrafters Aluminum Spiral Stamping Blank, 5-pack, Ready to Stamp Swirl Shape with Pre-drilled Hole - 16g (.050) Hypoallergenic, Tarnish-free 1100 Aluminum Genuine NinjaCrafters Hand-punched, Hand-finished Blanks, Pure 1100 Food Grade Hypoallergenic Aluminum Sturdy 16 Gauge (.050) Aluminum, Thickest Spiral Stamping Blanks on Amazon These measure 1-3/4" at the widest point and are great for pendants, keychains and more Ready to stamp right out of the bag - we've done the hard work for you, so you can focus on being creative The highest quality aluminum metal blanks for handstamping are made by the Ninjas - artisan crafters who know what you need.