Beautifully frustrating. The Jack Puzzle is composed of six different notched brass bars that interlock in one specific way to create a unified "jack" shape. It is exactingly milled, and weighs just over one pound. A Desk Accessories object, a paperweight, and a true distraction — but be warned, if you take it apart, you might not be able to figure out how to put it back together…(thankfully, hand-drawn assembly instructions are included).