Build and race this exciting air car that moves well on flat surfaces! Learn about potential energy stored energy and kinetic energy along with gravity friction and rotary motion. Students can decorate the body of the racer. Comes with: Multiblocks Green Clip Connectors Blue Slit Rods 0.79 (20 mm) Long Slit Rods 3.14(80 mm) Long Slit Rods 3.93 (100 mm) Long Slit Rods 7.87(200 mm) Long Tubes 7.87(200 mm) Long Gears 1.57(40 mm) Diameter Wheels 0.98 (25 mm) Diameter Electric Motors 3 V DC Battery Holder with On/Off Switch 3 V DC Washers 0.11 (3 mm) Diameter Bolts/Nuts 0.59(15 mm) Long Collars Blue Rubber Bands 1.57(40 mm) Long 3Bladed Propeller Plastic Strip Red Bag Piece of Sand Paper Requires Kre8 Tube Cutter or snips as well as [2] `AA` batteries.