Tubular belay devices are the perfect companions for the belayer who needs a simple yet super effective device. The loop of rope passes through the holes and is then clipped with a carabiner to the harness. Arresting a fall is done by holding firmly the rope. Tubular belay devices have one or two holes through which a single rope or a pair of twin or half ropes can pass and can also be used for belaying the second climber. Some of them can also be used for rappelling. DMM is a Welsh brand founded in 1981 by four friends addict to mountain and climbing. They aimed at producing gear at the best possible quality by at the same time keeping the prices low. Thirty years later DMM is one of the best-selling brands for hardware and employs more than 150 persons. DMM also produces professional gear for work, which contributes to the research and the improvement of all the equipment.