Overview: Speed run fanatics and drag racing enthusiasts crave one thing, more power! The 1721-2400Kv mechanical design boasts a stainless-steel sleeve to reinforce and strengthen the rotor for high RPM operation. Coupled with a massive 8mm stainless-steel motor shaft, 8mm bullets and high strand, low resistance, silicone coated 8-gauge copper wire, it delivers massive power and maximum top end speed. It is intended for use in 1/8 and 1/7 vehicles up to 8s Lipo, and the perfect compliment to the Castle Mamaba XLX2 ESC.