This provides children with a safe, durable wooden marble run toy set About Our Ball Drop Toy Set: This wooden marble run set includes 30pcs leaves (6 colors/size types, 5pcs each), 12pcs upgraded larger balls (6 colors, 2pcs each), 2pcs sturdy pillars (35cm×3cm/13.78in×1.18in, L×W), 1pcs thickened bottom board, 1pcs wooden connector, 1pcs screw, and 1pcs wrench Wooden Tree Toys: Drop the balls into the top leaves—they'll roll down the wooden musical tree to the bottom board without falling off. Upgraded Wooden Marble Run Music Tree: The balls' sizes are increased to 3cm (1.1in), the inclinations of the wooden marble tree's leaves are all increased for smoother ball rolling, and the slots on the wooden pillars are tightened—all to let each leaf firmly fixed to the pillars. The bottom board then collects the balls, keeping them from getting scattered or lost Wooden Music Tree: Our marble runs for 3-5 4-8 8-12 years old.