The term “Rollers” refers to spearguns that have pulleys to help load the weapon more easily. The usage of self-lubricating bearings and bushings inside the pulleys ensures optimal sliding of the rubber, increasing the speed of the outgoing rod.
The rubbers in the roller speargun are pre-tensioned, i.e. the rubber under the barrel is preloaded and only then is the rubber itself hooked to the shaft, passing through the pulleys on the head. By adding additional pulleys near the release mechanism, the rubbers can pass through the frame, increasing the preload and power of the firearm.

In summary, the use of the "Arbalets Roller" ensures a smoother and faster shooting experience, allowing for the use of larger diameter rubbers and greater control over the preload and power of the weapon.