Card Case for Debit / Credit Card and others promotional cards.
Very interesting model, you can use any A4 paper and turned it into B5 and fold it as per diagram.
NOte: A4 Paper Size : 210 × 297 mm or 8.27 × 11.69 inches
B5 Paper Size : 176 x 250 mm & 6.9 x 9.8 inches