8-Piece Wisdom Ring Set Toy Educational Brain Training Puzzle Game Mystery Ring Hand Play Toy Riddle Solving Riddle Solving Killing Time Education Play Toy Fun Children Adults Product Details Puzzle Type Untangling Number of Pieces 8 Product Dimensions (L x W x H) 11.5 x 2.8 x 16 cm Theme Mystery Included Components Main Unit* A set of 8 wisdom rings that both adults and children can enjoy. You can have fun brain training during your free time.* Easy to play!! Success if you can separate the two rings without force!!* It's fun to play and exercises your brain.* For children's studies and education. It also improves adults' thinking skills.