DIY boat engine drive kit RC 15 cm shaft propeller sets for adult children teenagers Description: [Durable]: dual DIY 130 engine, made of ABS material, durable. [Educational Toy]: Specially designed for children over 7 years old, improves interest in learning, develops intelligence to improve interest in learning. [Do it sam] This scientific DIY model is perfect for creating your own remote-controlled boats up to 30 cm in size. [Scientific Projects]: Teaching materials can practice manual skills and hand-eye coordination, develop intelligence. [Perfect gifts]: nice birthday, Christmas gifts for children, children. Specification: Engine height: 25 mm Output shaft: 2,0 mm Output shaft length: 8mm Rated voltage: 3V, use the recommended voltage of 36V Voltage: 3V Current: 80 mA Speed: about 10 000 rpm. or min Voltage: 6 V Current: 150 mA Speed: about 20 000 rpm. or min Size Chart: Shaft length: 15 cm or 5,91 inch The package includes: Powerful 2x130 motors 2x motor mounting bracket 2x copper connector 2x drive shaft 2x propellers (front and back)