Equilateral Prisms 3pc set, 1in, 2in, and 4in lengths, Material: Acrylic, Each prism is individually wrapped to protect it Will create a rainbow with any standard light source (phone will work) -- use a dark piece of paper with a 1-2mm slit, Size: 25mm face size
Electric Mobility Experiment Set, 6 Different Models Can Be Built With One Chassis, Examines The Strengths And Weaknesses Of Each Solution, Compatible With All Other Horizon Kits, For Measurement, Etc, Includes fixed Steering Function At Front Of The Vehicle