This is a self-belay sling from Edelrid, a leading climbing equipment manufacturer in the UK. It's a model that's often seen recently, capable of both self-belaying and rappelling. For more details, please see the URL of the easy-to-understand official website below: https://edelrid.com/int-en/sport/lanyards-shop/switch-double-adjust?sort=new_desc&filter%5Bkategorie_id%5D%5B0%5D=778&variant=2786953 Thank you.