MontBlanc Wallets. SKU: 130259. Color: No Color. Size: 100 5 85 mm. Montblanc Exteme 3.0 Leather Card Case. This card case combines a sleek, clean-lined shape with luxurious leather made using a CO2-neutral tanning process, enhancing its eco-friendly appeal. With space for up to six credit cards and banknotes, logo print, it also features a practical ring that can be attached to larger bags or a separately sold neck strap, keeping all your essentials easily accessible. Material: Cowhide, Lining: Recycled fabric.