Refillable with OPTIMA cards A great and practical way to keep coins, banknotes, stamps, postcards, and much more. Superior ring binder portfolio made of synthetic black leather with a zipper closure. The case's sturdy zipper closure guards against loss and damage. External Dimensions: 285 x 225 x 35 mm; Holds: 30 OPTIMA sheets or 10 OPTIMA coin cards Refillable with Lindner Banknote or OPTIMA Coin and Banknote sheets with a cover-mounted sheet pocket robust 4-D ring system