Steam Engine Model Kit, Balance Type Mini Pure Copper Steam Engine DIY Assembly Science Experiment Toys for Adults Kids (Without Boiler)

Spicyfy Steam Engine Model Kit, Balance Type Mini Pure Copper Steam Engine DIY Assembly Science Experiment Toys for Adults Kids (Without Boiler)

ELCOHO Educational Electric Circuit Kits Toys Science Montessori Learning Kits Electronics Motor Kits with Storage Bag for DIY Science Project, 23 Pieces

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