Make your own STEM marble challenge on windows and walls with 13 reusable cling-back track pieces.

Build critical thinking skills with fun STEM activities.
STEM Explorers Marble Runners includes 13 reusable track pieces that adhere to most smooth surfaces and can be used over and over again – no permanent adhesive needed!
Use them at home or in the classroom on surfaces including walls, and windows to build fun marble challenges.
The set includes 13 track pieces, 2 balls, double-sided challenge cards, and Activity Guide.