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Easy to install and disassemble, suitable for many projects at home and in your classroom. Great for robot toy, student lab project, STEM class, motor powered cars, engineering class and more Tips: Mini size, easy to install and save, put them in a sealed bag when not in use to prevent damp rust Note: Small parts, keep them far away from children under 3 years to avoid choking Features: Rated voltage: DC 3V Rated speed: 15000 RPM Motor size: 38 x 20 x 15 mm/1.5" x 0.8" x 0.6" Shaft diameter: 2 mm/0.08" Shaft length: 10 mm/0.4" Material: metal Package includes: 12 x 3v dc motor Customer service: If you have any question about our product, please click the“seller contact”button in your amazon account to email us, we will reply as soon as we can