Plastic The perfect solution for all those Duplo bricks you have laying around! Just add Hubelino's 55 Piece Run Elements Set and you'll have an amazing Marble run! Alternatively, you can combine this set with our 105 pc White Building Blocks. 55 Pieces included:10 slides, 3 terminals, 14 tracks, 14 turns, 5 U turns, 4 tunnels, 1 junction and 4 marbles All Hubelino products are 100% compatible with Duplo bricks and are produced in Germany where they are tested to all European and US safety standards for toys. Hubelino's marble run products promote spatial intelligence and an elementary understanding of physical principles. Thanks to age-appropriate difficulty levels, builders young and old can take an exciting trip into the world of physics. Hubelino products are made of high quality ABS plastic and are machine washable up to 100 degrees F. Suitable for beginner and master builders from ages 4+.