450 Class Radius Arm Sale! from 459 /per Qty. Add to Cart This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted. This plastic radius arm is a great replacement for the Align Trex 450, Tarot and many other 450 size helicopters. Compatible with - Align Trex 450 S, SE, DFC, Tarrot, Blade and many other helicopters Qty available:1 SKU:HP45009