I get mine from ParacordGalaxy.com - my standard supplier for all kinds of fun gear. They really do have the best selection and best prices for many great items.
The buckle body is hard plastic and it serves as sheath for a very sharp knive blade. It is commonly used on paracord survival bracelets but can also be used on lanyards, key fobs and other items. Weave the cord so one end attaches to the slot in the plastic knife handle. The cord then acts as an extension of the knife handle, making it easy to hold and manipulate.
The video below demonstrates how convenient the knife is and how it could possible be used..
