Quadrilla - Basic Builders Add-On Spacers and Levelers Add strength and stability to any Quadrilla marble run with extra wooden base plates and levelers. Durable child safe paint finish and solid bamboo and wood construction are hallmarks of Hape toys. Hape's toys stimulate children through every stage of development and help nurture and develop their natural abilities. All Hape products sold in North America meet or exceed all applicable safety standards. Keep the good times rolling Quadrilla is the ultimate marble run building set Endless possibilities for 3-dimensional thinking, creating captivating structures Recommended for ages 4 years and up Non-toxic finishes and child safe materials