Racing Wire No. 11 - String Brainteaser Metal Puzzle - Walmart.com
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Amazon.com: Metal Brain Teaser Puzzles 6 Pcs Set for Kids, Teens, and Adults, Metal Nail Puzzle for Mind Teasing, IQ and Logic Building, and Fidgeting : Toys & Games
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Racing Wire No. 18 - String Brainteaser Metal Puzzle-3288EU