UGEARS 3D Puzzle Marble Run Chain – Creative 3D Wooden Puzzles for Adults with Rubber Band Motor – Marble Run Chain Wood Model Kit – Unique Wooden Puzzle – 3D Puzzles for Adults and Kids Building Kit

This marble run for adults has 400 pieces and affords 7 hours of engaging assembly time of “medium” level complexity. Build this wooden construction kit alone or in good company. Everything you need for this marble race set comes right in the box, including 10 glass marbles with a 5/8 inch (16 mm) diameter, which is one of the most popular marble sizes.
Product Dimensions 10.83 x 12.01 x 10.63 inches