Marble Run Track Building Blocks Kit

BRAIN BUILDERS THAT PACK ENDLESS FUN! Crazy Marble Run Track Building Blocks is a timeless-classic built into the Perfect  STEM teaching activity! It combines the imaginative fun of construction play while boosting cognitive and motor skills! SAFEST&DURABLE MATERIAL: Each building block is made of Non-toxic, BPA-Safe, Lead-Safe, Phthalates-Safe ABS material, Conform to ASTM F963-17 US safety standards. Smooth edges & reasonable designed size to avoid scratching hands and choking problems. COMPATIBLE BUILDING BRICKS: Totally 43-336 Pcs large building bricks are packed in an exquisite color package. which are 100% compatible with all major building blocks. Allow kids with their imagination and creativity to DIY various models  Inside come with detailed instruction. STEM EDUCATION LEARNING TOY: This stem marble run building block is a perfectly designed toy kit that Inspires toddlers’ imagination and creativity to build a creative magical roller coaster fun set and