This is the Ace RC Ripper 50/06-50H Series Outrunner Brushless Helicopter Motor from Thunder Tiger. FEATURES: Dual ball bearing shaft support Ideal brushless conversion for the Thunder Tiger Titan X50 series Advanced 0.2mm laminations and cooling fan INCLUDES: 50/06-50H Series Brushless Motor, 4mm Male and Female Bullet Connectors, Instruction Sheet, and three sections of Shrink Wrap SPECS: Voltage Range: 8-12S LiPo RPM per Volt: 630 RPM/V Shaft Diameter: 0.24" (6mm) Shaft Length: 1.52" (38.5mm) Max Efficiency Current: 20-70A Current Capacity: 90A/60S Internal Resistance: 16 miliohms Weight: 15.77oz (448g) Can Diameter: 2.05" (52mm) Can Length: 2.44" (62mm) Mounting Hole Diameter: M4x0.7" COMMENTS: The motor needs M4 x 10mm mounting screws which are not included with the motor. jxs 10/15/12 ir/jxs