edu-matic Mini-Mags 45 Piece Magnetic Marble Track Tiles SetThis mini magnetic marble track tiles set consists of 45 pieces, including 8 windows, 14 marble tracks and 7 balls. These magnetic tiles are a fun way to play with cause and effect and there are hundreds of ways to build your ramps. Combine them with any of your other mini mags sets to create even bigger tracks. Children from the ages of 2 and upwards can explore gravity, speed, acceleration and so many other great physical properties in a fun and