ONE reels are characterized by the reversible vertical winding and the retractable arm. The shape of these reels is particularly backward and the reduced dimensions, in order to bring the least disturbance during the fishing action and to weigh as little as possible on the balance of the speargun. The vertical position, the sliding roller and the particular "line-presser" (or line-tensioner) appendix make the phenomenon of the wrinkle practically impossible. The clutch with a large friction surface allows the drum to be locked if necessary, or it can be opened in an instant using the traction of the fish. The recovery arm in stainless steel, while being long and robust so as to guarantee a generous lever even for the recovery of large prey, does not cause any disturbance, disappearing inside the drum during fishing. The small size of the drum takes into account the excellent performance of modern 1.5 mm lines. The ONE 50 model contains about 50 Mt. and the ONE 80 model about 80 Mt. They are reversible because they are also designed for left-handers. The reels are sold, as standard, with sleds to be mounted on ONE and Omersub spearguns, Cayman series and now also for Cressi with the dedicated sled.