It is a rack that fits on the back of her closet door to keep all (actually about 2/3) of her necklaces tangle free! My wife is something of a fashion-ista and has a ton of jewelry, some of it expensive. She is kind of rough on them too because she wears them pretty much all of the time. This was my solution to keep them from being damaged, tangled and lost..
You will need, a level, tape measure, mounting brackets and screws, eye hooks,pencil, and rubber feet (from furniture section in Home Depot) .
I used a 2x4 sheet of MDF board about 1/4 inch thick. Im not sure about the prices on a lot of these items, because most of them I had stored in my garage. I got this stuff from Home Depot and Lowes.
These are most of the thing you should start with.