This is the Trinity D3.5 13.5 Turn Super Spec Pro Brushless Motor. FEATURES: 540 size, sensorless design works with most racing ESCs Ideal for touring, off road, oval and other applications Optimized for 1-3 cell LiPo usage Short high RPM stator for lower resistance Sintered Neo magnet rotor, precision ball bearings Adjustable timing Lightweight end plate for less weight and lower center of gravity for better handling Team Epic warrants that this motor meets all factory specs at time of purchase and is free from any manufacturing defects. No other warranty is implied. INCLUDES: Trinity D3.5 13.5 Turn Super Spec Pro Brushless Motor with Instructions SPECS: Length: 2" (52mm) Diameter: 1.4" (35.9mm) Shaft Diameter: 0.12" (3mm) Weight: 6.2oz (175g) jxs 08/13/12 ir/jxs