This is the Trinity D3.5 Maxilla Spec 17.5 Turn Brushless Motor. FEATURES: Designed to fit all R/C vehicles from 1/12 scale on-road to 1/10 scale short course trucks Sensorless design works with most racing ESCs Adjustable timing Short high RPM stator design Sintered Neo magnet rotor Precision ball bearings Operates at 3.7 to 14.8 volts with correct gearing Vented for cooler operation INCLUDES: Trinity D3.5 Maxilla Spec 17.5T Motor with Sensor Wire and Instructions SPECS: Length: 2.1" (53mm) Diameter" 1.4" (36mm) Distance between Mounting Hole Centers: 1" (25.4mm) Shaft Diameter: 1/8" (3.2mm) Weight: 6.17oz (175g) approximate jxs 10/22/12 ir/jxs