9 Pieces Metal Puzzles: there are 9 pieces of puzzles for adults in different difficulty, which is carefully designed to exercise your brain, helps with practicing concentration and focus Reliable and Safe to Play: these metal puzzles are made of safe and reliable stainless steel, with smooth hand tactility, and have no pointed edges, which will provide you fun without getting hurt; Sturdy and durable, not easy to break or deform even when thrown or stepped on Challenge Mind Game: the metal…