This is a pair of completely unused DMM Clipper leashes. They fit previous generation of DMM Tools that have a clipper hole in the middle of the shaft: Rebel or Anarchist. They would also fit Grivel X Monster.
Basically, they are an emergency equipment for climbing with leashless tools: once in a while you might find yourself on a particularly challenging pitch where that extra margin of security against the pump may be desired. I am asking $65 for the pair.