XRAY item 305341 - Drive Axle Lightweight Hudy Spring Metal T4 2017 Specifications (300023) T4 Series Super-lightweight drive axle for XRAY T2, T3 CNC-machined from world-renowned, top-secret HUDY Spring Steel. Strategically machined for toughness and light-weight without compromising energy. Reduces rotating fat by around 35per cent over standard outdrive.