MontBlanc Card Case. SKU: 130813. Size: 75 10 105 mm. Montblanc Sartorial Leather Card Case. This leather card holder offers functional details both on the exterior and interior, featuring three credit card slots, a business card compartment, and an additional pocket. The outside also includes an extra slot for a fourth credit card. Material: Calf-skin leather, Lining: Cotton and polyamide.