YO506S Made of high quality metal. Precision machined. Stable performance. Specification: 4mm. Designed to repair or replace old or broken feathering shaft for 450V3 helicopter. Suitable for Align 450V3， KDS 450V3 and CopterX 450V3 helicopter. Offers your 450V3 helicopter a new look. Can be sold separately. Package Details Weight: 13.91 g Size: 5*0.4*0.4 cm Package Includes 3 × Feathering Shaft