About this item Metal Brain Teaser 6 Sets for Kids and Adults - All the coils and blocks are smooth and have NO SHARP EDGES for endless play without getting hurt. The links are made from heavy-duty 4.5 stainless steel that doesn’t easily bend or break even when thrown or stepped on. Players can’t force them open so there is no chance of cheating. Classical Intellectual Disentanglement Brain Puzzle Toy Game rank from fairly simple to difficult specially designed for kids and adults to stimulate the potential of thinking, develop intelligence and practice manipulative ability. This Metal Teasers Puzzle toy look simple, but contains lots of mysteries, definitely a good choice to exercise brains, improve problem solving abilities, relieve pressure at any leisure time or send as a gift to your friends. Metal puzzle condenses with traditional Chinese culture and they are quite interesting to creative thinking and improve both your IQ and EQ. 3D Coil Cast IQ Logic Educational Metal Wire Puzzle Chain Solutions - Great gift for boys, girls, men, and women ages 5 to 105. The perfect size makes it easy for small and large hands to play comfortably. Everyone can enjoy these unique novelty gifts, from children, teens, and adults. Can be played by a single player or a group. Give as gifts for birthdays, Halloween, Christmas, as well as party favors. Caution, not suitable for kids 5 years old and below. › See more product details