This looks to be a hollow wooden ball coated with black modeling putty and studded with thumbtacks. It is perfectly round, and look and about four inches in diameter. Each tackhead is a warped little mirror and if you stare at it closely, sildenafil about four-dozen yous stare back. My folks bought it for me in London. It has survived numerous drops on the cement floor with no apparent ill effects. It has no discernible practical use.