Treasure Blocks- Clear features transparent windows that are perfect for observing or displaying small objects Holds marbles, beads, twigs, leaves, small toys and more; accessories and natural materials sold separately Use for color exploration and light table activities Removable panel has screws to keep objects secure until ready to be replaced Largest block measures: 5.5" L x 5.5" W x 2" H What can we find today? Collect trinkets, natural materials and sensory objects to place in the beautiful Treasure Blocks. Smooth hardwood frames with inset, transparent acrylic windows have a removable panel to place small objects to observe or display. Ideal for color exploration and light table activities. Holds marbles, beads, twigs, leaves, small toys and more. Two screws on the removable panel keep objects securely in place until ready to be replaced. Set of 8. Largest Block measures 5.5" L x 5.5" W x 2" H. Ages 3+.