Thames & Kosmos SpringBots: 3-in-1 Spring-Powered Machines

Thames & Kosmos SpringBots STEM Kit | Build 3 Spring-Powered| Race car, Walking Robot, Countdown Timer Powered by a Mainspring | Learn About Potential & Kinetic Energy, Gears & Springs, Black , 10 x 2.5 x 11 inches

Thames & Kosmos Mega Cyborg Hand STEM Experiment Kit | Build Your Own GIANT Hydraulic Amazing Gripping Capabilities Adjustable for Different Sizes Learn Pneumatic Systems

Thames & Kosmos SolarBots: 8-in-1 Solar Robot STEM Experiment Kit | Build 8 Cool Solar-Powered Robots in Minutes | No Batteries Required | Learn About Solar Energy & Technology | Solar Panel Included