Premium Material: Our unique puzzles are made of durable 3mm thick crystal acrylic, precision laser cut to fit together accurately. The colour-changing acrylic puzzle, when you put it together it forms a round shape and takes on a rainbow shades with movement • Unique Design: The transparent puzzle is designed to be completely different from traditional puzzles, no pieces is the same, increasing the challenge and promising an exciting and challenging puzzle adventure like no other • Widely Application: This is an educational toy for children, the acrylic puzzle can be a good way to develop children's intelligence and thinking ability. It is also a good tool for adults to pass time or reduce stress. It is also an ideal gift for family and friends on holidays or anniversaries • Extremely difficult: An impossible puzzle, but a great gift for puzzle lovers who need a challenge. You'll need to spend enough time and patience to feel very satisfied and proud when you've solved it • Package Includes: You will receive 141 pieces of the puzzle game in a beautiful box, perfect for gift giving Brand new in box! I accidentally ordered 2 of these! Super cool gift!