It's like a cheese grater for your soap bar. The "soap flakes" are apparently really easy to lather, and you can have multiple people sharing a bar of soap in a sanitary way without a loofah/wash-cloth.
This is such a fantastic idea. Liquid handsoap is watered down and a waste of money... but I hate touching a slimy wet barsoap... using a grater to make a rationed portion of soap flakes per use... BRILLIANT!!!!