Innovative emergency blocker. Designed for single ropes with a diameter of between 8 and 13 mm, the Duck is the first blocker in the world capable of working even on flat and tubular webbings from 10 to 15 mm wide, although these - is well known - are not approved for progression. Very small in size, it is easy to insert even with one hand. Furthermore, the wide attachment hole allows the rotation of the ring carabiners. Duck was born as an emergency blocker useful in maneuvers of recovery, self-rescue, progression in preservation and as a regulator for caliper or daisy in webbing.