MindWare KEVA Contraptions, Wooden Blocks Building Set, Marble Run Kit, Includes 2 Balls – 400 Planks

From the brand

Toys that Teach: These learning resources help builders gain first-hand experience with balance, leverage, geometry and the principles of physics every time they design, stack, adjust and construct
Endless Marble Run Possibilities: Build an entire city or an enormous sky scraper, create castles complete with stairs and turrets and more; the sky’s the limit with these Montessori toys
Individual or Group Play: Ideal for use at home or school, these STEM toys help kids gain an understanding of balance and proportion, as well as an interest in architecture, building and design
No Hassle Wood Building Toy: With no glue or connectors needed, these wooden blocks are ready to play right out of the box, no extra tools needed; simply unpack and build
Complete Wooden Building Blocks Set: Includes 400 KEVA planks, zippered canvas storage bag, 2 KEVA balls and an 18-page full-color idea booklet with build-out instructions (Ages 7 and up)