Metal Brain Bogglers _Set of 12 _ Take-Apart Style Puzzles _ in 2 Tins Set of ten polished metal take-apart brain teaser puzzles. Come in colorful red and blue tins. Tins are 3.5 inches tall and 3 inches in diameter. TWO bonus add-on metal puzzles. Great for testing one's ability to disentangle 2 metal pieces and then rejoin. Medium challenges which are fun. Not too difficult ! Everyone's experience will differ.