... :1~3V Speed:10000~40000 Weight:4.1~4.6g Coreless motor is very small and often used in Handphone for ... , Car motor, Carbon-brush motor,precious Metal-brush motor and Coreless motors ,Smart Door lock motor.Smart electric meter motor ect ... -2430, MFF-12, MFF-1527, MRF-2430 ect MRF-0724B Coreless motors