Universal Compatibility and Size - This key chain holder is designed for coins, medals, and medallions up to 34 mm in diameter. It accommodates a wide range of items including ship line medallions, AA, NA, Aldi quarter, Apple Airtag, 34 mm Challenge Coin, Game pieces, and most ship line medallions. Superior Quality and Material - The case is highly durable and lightweight, providing reliable long term use. Crystal Display with Protective Window - Exhibits both sides of your coins or medals through a dual sided display with a transparent yellow protective window. Protection and Durability - Offers protection against scratches, dirt and moisture to keep contents looking clear and clean. Gift and Everyday Use - A practical gift for someone in recovery or a thoughtful accessory for everyday carry. It can be attached to switches, belts or cords and easily fits into a bag or pocket, helping keep the soberness in mind. Use Scenarios - Daily display and secure transport: Carry and show coins or medallions up to 34 mm in size while protecting them from wear in a lightweight key chain. - Collectors on the go: Use during events or meetups to keep small medals or tokens visible and safe in a compact case. - Recovery support gift: Give as a considerate gift that can be attached to belts, switches or cords and carried in a pocket or bag to remind the wearer of their soberness.