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This project sets out to create a low-cost bionic hand with excellent benefits, using a single high-torque actuator per finger. To assemble the device, you'll need to drill holes for M3 or M2 screws and file some parts. The required components include: 4x union pieces 4x phalanx gear units 4x phalanx_1 units 4x worm gear units 1x palm component 1x wrist lead 1x upper lead 1x bottom lead 1x thumb unit 4 DC motors, specifically Pololu micro metal gear motors with a 250:1 ratio You can find these motors at https://www.pololu.com/product/1095. Alternatively, you can use modified worm metal gears or plastic ones. The project also requires: An Arduino Nano board, available at https://www.amazon.es/ATmega328P-Arduino-Compatible-versi%C3%B3n-mejorada/dp/B00Q6WTWGO/ref=sr_1_3?ie=UTF8&qid=1487594993&sr=8-3&keywords=arduino+nano Two Pololu DRV8833 motor drivers, available at https://www.pololu.com/product/2130 A Micro servo motor, such as the Tower Pro mg90s, available at https://www.amazon.es/compatible-pi%C3%B1ones-metalicos-radiocontrol-robotica/dp/B01DZQT5UG/ref=sr_1_2?ie=UTF8&qid=1487594852&sr=8-2&keywords=servo+mg90s A Myo ware muscle sensor or other control sensor.