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20 see-through Marble Run pieces allow you to see all the action
Solid plastic pieces that stick together and are easy for kids to play with
Compatible with Marbulous Marble Run Toys including our Marble Genius Marble Run Starter Set (60 pc.), Super Set (85 pc.), & Extreme Set (125 pc.)
Standard Toy Size Marbles (5/8 inch or smaller) work with this set
5 new & unique pieces not that are not available in any other Marble Genius online sets
Marble Genius Booster Set (Add-On Set - 20 Marbulous Marble Run Toy Pieces) - B06X9CMMQH