SilverStone TOB04 is a built-in slim type DVD-RW optical drive for Blu-ray / DVD / CD disc writing. The TOB04 also comes with a 12.7mm bezel, which will fit in either 9.5mm or 12.7mm optical drive slot. If you have a notebook or desktop PC and need a Blu-ray Slim Optical Drive, the TOB04 is a must have.