Montblanc Key Fob Meisterstuck Loop with Hook 118321. The Meisterstuck Key Fob Loop is crafted in black leather with the Montblanc deep shine. As part of the Meisterstuck collection, this luxury key holder stands in the long tradition of products crafted with the quality leather and the iconic Montblanc three ring motif. It features a simple and elegant design, with two metal rings one fixed, one removable and can be hung on bags as a charm, thanks to the practical hook.