Sntieecr 6 Set 131 PCS DC Motors Kit, Mini Electric Motor 1.5-3V 15000RPM with 66 PCS Plastic Gears, Shaft Propeller, Bulbs, Buzzer Sounder, Science Experiment Set for Kid DIY STEM Engineering Project

COLORFUL SHAFT PROPELLERS: 12 Pieces 2 style different colors shaft propellers, 6 pieces 4 Vanes shaft propellers, 6 pieces 3 Vanes shaft propellers can meet your different needs, let you make science and STEM projects much more fun and more choices to fit your experiments
DC MOTORS: Body Diameter: 28mm/ 1.06″; Mounting Hole Distance(center to center): 15mm/ 0.59″; Shaft Size: 10 x 2.0mm/ 0.39″ x 0.08″(L x D); Motor Body Length: 38mm/ 1.46″
WIDE APPLICATIONS: This complete electric motor kit good for kids experiment and explore basic electrical simple circuits. It can also be used in school in science, STEM, technology and design courses, easy to meet your project needs, properly educating some circuit knowledge would be a good interaction time with your kids together
WARNING: Suitable for 8+ years. Be careful of scald caused by short circuit. Do not mix old and new batteries. Do not mix alkaline, standard (carbon-zinc), or rechargeable batteries, the kids must use under the supervision of adults. It is recommended that the voltage be 1.5V-3V. If the voltage is 3V, please control the time. The use time should not be too long, and the time should be controlled within 3 minutes. After 5-10 minutes, the circuit will generate heat and short circuit