24 different styles of metal wire puzzles are made of high-quality metal.[High-Quality Metal Puzzles] We use an integral forming process to ensure the puzzles are smooth and gentle to the hands. We use three layers of nickel plating to prevent rusting or bending with use. [Benefits of Puzzle Games] Playing this Metal Wire Puzzle can improve the ability to observe, understand, analyze, and reason; it can train divergent thinking and attract children's attention.[Good Social Assistant] It's a cool gadget to share with friends and family.[Unique Gift] It's a unique and exciting gift for stocking stuffers, Christmas, New Year's, birthdays, etc.SIZE:20*15*3CM