This holder is specifically designed for impact testing coins made of gold and silver. The test involves gently tapping the coins with wooden or plastic objects, and the sound produced helps determine whether the coins are genuine or fake. Precious metals like gold and silver produce a clear, resonant tone, while non-precious metals yield a dull, short sound. This design ensures the coins are securely fixed in place while preventing direct contact that could cause damage, and it’s optimized for 3D printing.