NATIONAL GEOGRAPHIC Magnetic Marble Run - 75-Piece STEM Building Set for Kids & Adults with Magnetic Track & Trick Pieces & Marbles for Building A Marble Maze, STEM Project (Amazon Exclusive) DERMA-E Size: 2" x 2" square

Size: 2" x 2" square pads with 2

Brand: Simply Seniors

Can be used in many occasions

Power: 1* 9V Battery (Included)

Details: Made with Effective Natural Ingredient

NATIONAL GEOGRAPHIC Magnetic Marble Run - 75-Piece STEM Building Set for Kids & Adults with Magnetic Track & Trick Pieces & Marbles for Building A Marble Maze, STEM Project (Amazon Exclusive) DERMA-E Size: 2" x 2" squareBrand: Blue Marble Features: A KICKSTARTER SUPERSTAR This patented marble racetrack is the most backed Kickstarter magnetic super puzzle of all time! Each track and trick has its own unique properties just move them around to adjust or add exciting new pathways! DESIGN, BUILD, TEST, CREATE This wildly creative super puzzle includes 42 tracks & connectors, 17 trick pieces & 15 marbles for infinite building combinations and endless amounts of creative