This is the Align 430L Brushless Motor for the T-Rex 450 helicopters.  This model is the RCM-BL430L with 3550Kv, making it a great choice for those wanting a high-performance helicopter.  This works with the T-Rex 450SA, 450X, 450XL, and 450SE.

• Perfect choice for all-out 3D aerobatics or sport flying
• Lightweight, high-torque performance
• Internal fan and open endbells for maximum cooling
• Slotted 6-pole 'outrunner in a can' design