The Guidecraft Notch Blocks Set feature smooth sanded edges and notches that lock together allowing for big structures and endless building possibilities. With blocks of varying shapes and sizes, there is plenty to share, encouraging group participation. 89 piece set. 10 double-sided Concept cards included. Follow care instructions included for proper maintenance. Store in a cool, dry place. Ages 3+. Smallest block measures 6″L x 3″W. Largest block measures 30″L x 3″W.