Structures & Contraptions by  "11 years old" and "9 years old"

KEVA Brain Builders Deluxe

KEVA Contraptions Reactions

KEVA Contraptions 50 Plank Set

LEGO Chain Reactions

Engino Deluxe Architecture Set

KEVA Design Woods

E-Blox® Circuit Blox 395, Circuit Board Building Blocks Classroom Set, 264 Pieces

Q-BA-MAZE 2.0 Grand Prix Racing Set

Snap Circuits^®: My Home

Geomag™ Mechanics Gravity Loops & Turns: 130 Pieces

Spin-Gineer

Design Your Own Gumball Machine Kit

STEM Machines Engineering Kit

Q-BA-MAZE 2.0: Super Race Set

Spin-Gineer Construction Kit & Refill Rods: Set of 2

KEVA Contraptions 200 and 400 Plank Sets with FREE Bonus Planks

STEM Newton's Laws Engineering Kit