This is the Castle Creations 1410 1Y 4-Pole Sensored Brushless Motor w/5mm Shaft (3800kV).

For more than a decade Castle has been providing award winning brushless sensorless motors to R/C enthusiasts worldwide. In response to overwhelming requests by our customers, we have brought technological advancements together that will deliver unprecedented performance in our new SENSORED motor Line. Drivers in all applications demand clean starts when coming off the line. Crawler fans require high-precision low speed control and torque for climbing, racers need precision and predictability, and dragsters don"t have a millisecond to spare. Sensored brushless motors always know the position of the rotor, which eliminates cogging during the startup condition.

INTEGRATED SOPHISTICATION
Many customers have utilized our industry leading software functionality that *Castle Link offers. When paired with a Castle Creations sensor supported ESC, like the MAMBA MAX PRO or MAMBA MONSTER X, you can unlock advanced tuning capabilities that Castle Link provides specifically for sensored motors. SMARTSENSE™ uses the motors sensors to start the motor to provide excellent torque and low-speed drivability. Once the motor is turning it seamlessly transitions to Castle's ULTRA- EFFICIENT sensorless mode. As the motor enters distinct phases or transitions to different load points, a different timing advance is required for optimal efficiency. Using mechanical sensors alone, you can only target one individual phase or load point, such as higher start power or higher top end speed. This sacrifices performance and efficiency during the other phases. Electronic timing in SMARTSENSE™ will advance timing automatically for peak performance during all phases.

Features:
ROAR standard sensor port and labeled connections
6061-T6 Billet aluminum heatsink can
Sensor alignment method delivers uniform timing and torque in both directions, automatically
Kevlar wrapped rotor
REBUILDABLE design allows users to replace front end bell with bearings or rotors with shaft
High RPM NMB oversized bearings
13 AWG high strand wire with silicone insulation
OPTIMIZED design eliminates the need for mechanical timing adjustments
High quality, temperature-stabilized sensors
4-POLE 12-SLOT design boasts exceptional EFFICIENCY and produces LESS HEAT
High strength 180°C neodymium sintered magnets
QUIETSENSE™ Technology shields magnetic field noise generated from the motor coils and keeps motor and ESC in sync at all times
Hardened stainless steel shaft
High-purity, high-temperature copper windings
HIGHER PRECISION and MORE EFFICIENT startups
Oversized gold plated solder tabs for LESS RESISTANCE and easy soldering
Low resistance gold plated bullet connectors
High quality 0.2mm steel laminations

Specifications:
Application: 1/10 scale 2WD and 4WD SCT up to 6.5lb (2S) as well as 1/10 scale buggies and stadium trucks up to 4lbs (2S-3S)
Bushing Or Bearing: Bearing
Connector Type: 4mm Bullet
Input Voltage: 7.4-12.6V
Motor Design: Inrunner
Mounting Dimensions: M3 @ 25mm
Number of Poles: 4
Outer Diameter: 1.41 in (36mm)
Product Length: 2.08" (53 mm)
RPM/Volt (Kv): 3800
Shaft Diameter: 0.197 in (5mm)