Guidecraft Guidecraft Unit Block Marble Run - 40 pc. set: Rubberwood Education Learning Blocks , STEM Toy for Girls and Boys

Marble run features rubberwood blocks scaled to standard Unit Blocks and 4 starter acrylic marbles Children will practice building, explore physics, and learn architectural relationships Set can be rearranged in multiple marble run designs Expand possibilities for constructive play using standard Unit Blocks (sold separately) Set includes 36 blocks (2.75" wide, scaled to coordinate with standard unit blocks), 4 acrylic marbles and 10 double-sided inspiration cards Ages 3+