Marble Genius Marble Run Starter Set - 70 Complete Pieces + Free Instruction App (60 Translucent Marbulous Pieces + 10 Glass Marbles) 60 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 5 solid bases including 1 large base to ensure maximum stability Standard Toy Size Marbles (5/8 inch or smaller) work with this set (10 Glass Marbles Included) Compatible with Marbulous Marble Run Toys including our Marble Genius Marble Run Super Set (85 pc.), Extreme Set (125 pc.), Booster Set (20 pc.), & 9 Accessory Sets