3 years & up. What can we find today? Children can collect sensory objects, natural materials and trinkets to place in the beautiful Treasure Blocks. Smooth hardwood frames with inset, colored transparent acrylic windows have a removable panel to place small objects. Ideal for display, observation, color exploration, light table activities and more. Largest Block measures 5.5" L x 5.5" W x 2" H. Set of 8.