Go vertical with GraviTrax PRO! Completely compatible with all GraviTrax products. PRO offers new challenging ways to construct higher tracks. New elements expand your building possibilities. Experienced builder or new to GraviTrax - anyone can start with PRO. Encourages critical thinking, creativity and experimentation through play. This 153 piece starter set allows you to build higher tracks with less height tiles, build 3 dimensional structures with new walls and pillars and suspend tracks off your structures with balconies.For Ages: 8+WARNING: Choking Hazard; Small Parts. Not for children under 3 years old.