to store much more, including coins, banknotes, stamps, letters, and postcards Fits all OPTIMA Sheet types able to store up to 12 OPTIMA coin sheets or 50 OPTIMA sheets. Smooth, slightly padded cover has a flat spine and silver-colored embossing. sturdy 4-D ring system Refillable with OPTIMA Banknote Sheets and Coin Refillable with Lindner OPTIMA Banknote Sheets Over all size 270x220x40mm