Diameter? 40mm/1.57" Thickness: 3mm/0.118" The coin blanks for laser engraving is a great idea for DIY design The blank challenge coin can be a perfect gift option to your friends, family members, lovers, etc. Warm TIps? High-Quality Zinc Alloy ConstructionCrafted from premium zinc alloy, these coin blanks are durable, corrosion-resistant, and built to last. The sturdy material of blank coins for engraving ensures that your creations remain intact and maintain their professional look over time, without fading or breaking. Multiple Finish Options AvailableChoose from a variety of finishes, including gold plating, silver plating, rose gold/pink plating, or the raw zinc alloy finish. Each finish of challenge coin blanks provides a unique appearance that makes your engraved designs stand out, offering a luxurious feel to your personalized projects. Use caution: When coating is applied to metal, CO lasers (10.5m) or Fiber lasers (1070nm) are recommended for marking. Blue, purple, and near-UV diodes (370-460nm) are generally ineffective for embossing but may mark metals with specialized coatings or sprays. Convenient Size and DesignMeasuring approximately 40mm (1.57 inches) in diameter and 3mm (0.12 inches) thick, these blank challenge coins are compact, lightweight, and feature a distinctive gear-edged design. This makes them easy to work with, adding a fine touch of elegance to your finished crafts. Please double check DIMENTIONS before ordering Comes with Protective Plastic CaseEach coin blanks for laser engraving is packaged in a clear plastic case for added protection during shipping and handling. This ensures that your coins arrive in pristine condition and are ready for engraving without any scratches or damage. Perfect for DIY Craft EnthusiastsThese blank challenge coins offer a versatile surface ideal for engraving custom designs or text. Whether you're into jewelry making, keychains, or personalized gifts, the smooth surface of these coins allows for endless creative possibilities using laser engraving. You can engrave custom designs or text on the coins that can be paired with hooks, rings, pins, tassels, and more to create stunning earrings, necklaces, bracelets, and other decorative accessories.