Anodized Aluminum Challenge Coin Blanks | Laser Ready Engraving Stock (Pack of 5+)Ready to Engrave. No Spray Needed. Skip the expensive marking sprays and pre treatment. These Anodized Aluminum Blanks are engineered specifically for laser engravers. The anodized layer provides a durable, colorful finish that vaporizes instantly under the beam, revealing a sharp, bright white contrast. Why Makers Love These Blanks: Standard Size: [Insert Size] diameter fits most standard coin jigs and templates. Double Sided: Fully anodized on both