SINBRLAI Blank Challenge Coins 10-Pack 40mm Solid Brushed Brass — Threaded Edge, Individually Cased for Engraving

SINBRLAI 10-pack blank challenge coins are solid brass, threaded-edge disks sized 40 mm × 3 mm that arrive individually boxed and ready for custom engraving or DIY projects.

These blank challenge coins provide a sturdy, polished base for personalisation — ideal for engraving text, logos, or symbols and for turning into jewellery, keychains, or custom mementos. Each coin is crafted from non-electroplated brushed brass for a warm, long-lasting finish and comes protected in a transparent acrylic case so your blanks arrive scratch-free.

What are the physical specs and finish of these coins?

Each coin measures approximately 40 mm (1.57 inches) across and 3 mm (0.11 inches) thick, with a threaded edge profile that adds visual interest and helps with alignment during engraving. The blanks are solid brass with a brushed surface rather than electroplating, which produces a subtle luster and robust, wear-resistant character.

• Material: solid brushed brass for durability and classic colour
• Dimensions: ~40 mm diameter × 3 mm thickness
• Edge: threaded/serrated rim for a finished look and engraving guidance
• Finish: non-electroplated brushed surface that resists fading

How are the coins packaged and protected?

Every coin is packed individually inside a see-through acrylic protection box to prevent scratches or dents during transit. All ten acrylic cases are placed together inside a plastic storage box, which also helps you keep projects organized and ready for engraving or decorating.

• Individual acrylic protection boxes for each coin
• Grouped in a single plastic storage box for neat storage
• Packaging reduces surface blemishes and shipping damage
• Easy to view and access each blank without removing protective casing

What creative uses and DIY options do these blanks support?

These blanks are designed for customization — use engraving tools, rotary cutters, stamps, paints, enamel fills, or laser etching to add names, dates, logos, or decorative motifs. They work well as standalone commemorative coins or transformed into wearable and functional items with simple attachments.

• Engrave or etch logos, mottos, or serial numbers
• Add jump rings, hooks, tassels for keychains or pendants
• Convert into earrings, necklaces, or zipper pulls
• Paint, enamel, or patina for custom colour accents

How should I care for and finish these brass blanks after customization?

After engraving or decorating, keep the brass bright by gently polishing with a soft cloth and mild metal cleaner if needed. Avoid harsh chemical dips that strip the brushed finish; a clear sealer or protective lacquer can lock in paints or patinas and reduce future tarnishing.

• Polish with a lint-free cloth to restore shine
• Use mild metal cleaners for stubborn spots only
• Apply clear lacquer to protect paint or patina finishes
• Store in the included acrylic cases to prevent scratches

Who is this for: Artists, hobbyists, small-batch creators, and organizations seeking a reliable base for custom challenge coins, jewellery makers wanting consistent, ready-to-decorate pieces, and event planners or teams producing commemorative tokens. If you need a compact, durable blank to engrave, embellish, or repurpose into personalised keepsakes, this 10-piece SINBRLAI set provides a cost-effective, protected supply.