The lightweight of the Universal Shaft is attained by reducing the propeller shaft diameter from 4.2mm to 3.4mm (two piece set). The weight for the standard shaft is 35g compared with the lightweight shaft 29.5g (one shaft), a weight saving of 5.5g. Meaning along with four shafts put together, you can save an overall total of 22g. The above mentioned image shows two Lightweight Assembly Universal Shafts.