【High Quality】Puzzles made of quality metal that is not easy to rust, heat treatment surface with high toughness and no-deformation keep the metal ring more durable
【Release Stress】unlocking them may be takes a long time, which can also test fully your patience and attentive, let you feel relaxed and ease the pressure of work and study
【Develop Intelligence】Quite interesting traditional Chinese culture , a good choice to train your brain ,improve your logical thinking, develop your intelligence and practice manipulative ability
【Fresh and Interesting】24 kinds of interesting interlocked rings，different levels of difficulty provide a good amount of freshness and challenge, after getting each puzzles solved by yourself, then you will get achievement and always find it interesting
【Widely Applicable】Children over 5 years old improve their thinking ability, young people use it to relieve stress, and the elderly prevent Alzheimer's disease through exercise brain
