YO436B Made of rubber. Stable performance. Designed to repair or replace old or broken tail drive belt for 450V3 helicopter. Suitable for Align 450V3， KDS 450V3 and CopterX 450V3 helicopter. Offers your 450V3 helicopter a new look. Package Details Weight: 4.28 g Size: 12*7*1 cm Package Includes 1 × Tail Drive Belt