【80 Pieces Wood Marble Run Blocks Play Set】 The set includes a good variety of 70 wooden blocks and tracks, 10 glass marbles and a basic builder manual book. 【Open-ended Play】 Marble runs are the ultimate open-ended toy. Marbles run through the cube blocks with slanting holes and channels, and run along the tracks by gravity. Kids can easily follow the step-by-step guides that shows them how to build tracks, or challenge to create their own marble mazes, there's endless building possibilities. 【Collaborative Play】 Marble runs are also often collaborative.The set is compatible with other Onshine wooden marble runs set that can extend play options, enough for children play together, it helps develop co-operative skills of communication, discussion, negotiation, and compromise. Not to mention those all-important skills of patience and perseverance that are so vital to successful teamwork. 【Skills and STEM Development】 As children construct and build more complex marble run tracks, they will face engineering and physics challenges creating a working route for their marbles.So, children will need to use imagination as well as spatial skills. It also helps develop good hand-eye co-ordination, fine motor skills and creativity. 【Safe Toy and Great Gift Choice for Children】 The Onshine marble run play set are made of natural pine wood, all the blocks are smooth polished with rounded edges, and not painted, safe for children to play with. Great birthday present and gifts choices for boys and girls age 4 years and up.