The SURPASS HOBBY 2435 4500KV Brushless Motor and 25A Brushless ESC fit 1/18, 1/16 RC cars. 4500KV Brushless Motor has increased power-handling capabilities to give your R/C vehicle the power to run, and 25A Brushless ESC has excellent start-up, acceleration and linearity Features, they are the best choice for you. Features: 4 Pole 12 Slot Hi-torque Motor Design, and CNC Machined 6061 T6 Billet Aluminium Heatsink Can High Purity Copper Windings Maximizes Efficiency, and High RMP ABEC 5 Oversized Bearings Universal fit, fits 1/18, 1/16 brushless cars-multi-mounting system for M2.5 screws Precision balanced rotor, smoothness for best reliability and maximum RPM Stator - Super Thin (0.35mm) Laminations, Removable/ Replaceable Rotor, and Precision Engineered for Maximum Energy Conversion The strong resistant current capability, excellent heat dissipation. Multiple protection Features: Low voltage cut-off protection for lithium or nickle battery/Over-heat protection/Throttle signal loss protection/Motor blocked protection Easily programmed and compatible with pocket-sized program card. Specifications: Brand name: SURPASS HOBBY Item name: 2435 4500KV Brushless Motor Main color: Blue Watts: 300W Max voltage: < 13.2V Max Amps: 22A Rotor poles: 4 IO: 1.7A Resistance: 0.012 KV(RPM/Volt): 4500 Max RPM: 60000 Length: 35mm Diameter: 24mm Weight: 57g Shaft diameter: 2mm Length of extend shaft: 12mm Connector: 3.5mm gold Item name: 25A Brushless ESC Motor type: Sensorless Brushless Motor Cont. current/Brust current: 25A/100A Resistance: 0.004ohm Battery: 2 cells Lipo 4-6 cells NIMH BEC output: 5V/2A (analog mode) Suitable brushless motor: 12T Suitable car: 1/18, 1/16 Dimension: 30 * 25 * 14.5mm Weight: 29g There may be some deviation due to manual measurement. Package information: Package size: About 11 * 7 * 4.2cm / 4.33 * 2.75 * 1.65in Package weight: 126g / 4.45oz Gift box package Package List: 1 * 2435 4500KV Brushless Motor 1 * 25A Brushless ESC 1 * Pair Manual