Brain Teaser Puzzles - This puzzle set includes a Luban lock, ball Kongming, and corners Kongming, all smooth for brain games. They are durable and do not easily bend or break, even when thrown or stepped on. These brain teaser hand puzzles offer assembly and disentanglement challenges. Practice focus and concentration, use them as an IQ test challenge within a limited time, and enjoy the thinking and fun they bring. Gift For Every Occasion - Ideal brain-teasing gift for Christmas, office events, birthdays, Halloween, class rewards, and more. Enjoy this puzzle toy in the car, at school, at home, or in the office. It's easy to carry everywhere. Designed to be a convenient size and lightweight, this handheld puzzle is a travel must-have