Size Specifications: 300PCS Coin Holders, coin flips 2x2 inches with 6 assorted sizes - 17.5mm, 23.0mm, 27.5mm, 33.0mm, 37.0mm, and 40.0mm, which is sufficient for a diverse range of coin collections. Excellent Material: Crafted from high-quality heavyweight 300gsm white cardboard and premium PE clear windows. This coin flip is water and dirt resistant to ensures a lasting shine for your coin collection. Easy to Use: Simply place your coins into the clear windows, fold, and secure with staples or adhesive. Highly translucent PE windows both clearly display your collections and protect them from oxidation. The white cardboard allows you to record information about your coins. Versatile Application: Compatible with coins of various sizes, including pennies, quarters, nickels, dimes, cents, halves, foreign currency coins, souvenir coins, and more. The impeccable coin holders for all coins. MEANINGFUL GIFT: Coin collecting supplies make the perfect gift for family, friends and coin collectors. In addition, excellent customer service guarantees that you won't lose a penny. Please feel free to contact us with any questions. Coin Cardboard Flips