3 years & up. Great for indoor or outdoor use, this 89 piece set is made from FSC certified eucalyptus wood and weathers to a soft gray if left outdoors. Feature smooth sanded edges and notches that lock together allowing for big structures and endless building possibilities. With varying shapes and sizes, there are plenty to share, encouraging group participation. Smallest piece measures 6"L x 3"W. Largest piece measures 30"L x 3"W.