It's Tiger's driver. Not actually his driver, but one built to his exact specifications. Indeed, the Nike Vapor Speed TW Driver is marked with Eldrick's signature logo, and features a smaller (420cc) pear-shaped head than you'll find on the standard model, which gives it greater workability. Other notable features include a loft of 10.5 degrees, a Diamana Blue Board 73 shaft, and a bonded hosel. Tiger's been hitting it since December; it'll be available online and in select stores in limited quantities.