450 Class 11T slant cut motor gear (3.5mm / 3.17mm) Sale! from 498 /per Size 3.5mm 3.17mm Qty. Add to Cart This 11 tooth motor gear is a great replacement for your Align Trex 450 helicopter. Compatible with - Align Trex 450 Pro Tarrot, Blade and many other helicopters Options 1) 3.5mm 2) 3.17mm Qty available:2 SKU:iARC-007-3.5