AD08 are the older model..
AD08 r -pasted this from Yokohama's official web site..
Adding more carbon to the conventional MS Compound 2 improves dry grip. A touch of silica enhances wet grip. Further, Orange Oil, which is used in tyres competing at the highest levels of motorsports, delivers even greater road-gripping capability. Finally, the addition of a macromolecule polymer blend to the compound provides greater stiffness and improved durability.