Specification: Model: 2205 Framework: 12N14P No. of Cells: 3 - 4S Color: Red Length: 31.7mm Shaft: M5 Max Thrust: 1024g Diameter: 27.9mm Propeller Suggested: HQ 5045 BN Weight: 30g Features: Race Spec Performances High Strength N52 Neodyum Magnets Active Cooling Fins Greatly Reduce Motor Temeratures Low CG, Light Weight Design Japanese Bearing For Performances Enchance Anti Off U Ring For Safety & Stablility Dual Lock CW / CCW Locknuts Good quality, good operation. Comes in a sealed package, ready to install.