DEVELOPMENTAL PLAY: With the gears’ ability to twist, turn and be reorganized across the wooden board, children quickly develop an understanding of trial-and-error, problem-solving, cause-and-effect while using their logical thinking skills. Create endless sequences, combinations and patterns with the set!SUSTAINABLY-MADE: Each gear is sustainably designed to naturally bring children closer to nature. Crafted from PlanWood(TM), a unique material created from surplus sawdust and wood chips, each piece is colored with non-toxic, water-based pigments and is optimally safe for children.INCLUDES: 10 unique gears and 12 puzzle pieces. Suitable for children 2 years and older.