Made from durable, top quality material. These "hooks" are an ideal alternative for brass snaps, to use for connecting dog's harness to the tugline. Unbreakable, easy to work with, ultra light (saves extra weight on the whole gangline). Safes a lot of "dirty" and cold work of thowing frozen dog excrements, stuck on snaps, when trying to open them. This is a comeback of the old system the Inuits used, now more and more popular around the world, primarly used in Scandinavia for many years.