Roller Coaster Engineering Watercraft and Aircraft plus 2 go-karts with a

plus 2 go-karts with a launch function

a balance scale

With iD Auto-Battery Identification there’s no need to worry about the battery chemistry or capacity

Conductor Carl train sets have passed CPSIA compliance testing

Sing along with Anna from Disney's Frozen

Roller Coaster Engineering Watercraft and Aircraft plus 2 go-karts with aWARNING: choking hazard small parts. Not for children under 3 yrs. Design and build your own working roller coaster models Conduct fun, hands on physics experiments to learn about force, motion, energy, and more. Complete challenges that require you to build roller coasters of all shapes and sizes. The plastic building system is durable, easy to assemble, and reusable. The 32 page, full color manual guides building and experimentation with step by