sero (which is belt driven type) is a light & hish speed module made up with aluminium body combined with steel guide shaft and special machined speed guide carrier as it's slider. Belt tension cab be adjusted easily by lightening screw simply and it is easy to expand to several axis usage. * * * * Maximum speed : 8 m/s Maximum length : 4 M without any jointing (6M available on special order) Assembling Module : Using slot on the slide of aluminium body Repeatability: