The lightweight of the Universal Shaft is accomplished by reducing the propeller shaft diameter from 4.2mm to 3.4mm (two piece set). The weight for the standard shaft is 35g in contrast to the lightweight shaft 29.5g (one shaft), a weight saving of 5.5g. Which means along with four shafts assembled, you can save yourself a complete of 22g. The above mentioned image shows two Lightweight Assembly Universal Shafts.