Treasure Blocks- Primary features colorful, 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, colorful, 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. 8 blocks. 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+.