I just pinched this online as a guide for you... SuperBest would be Grade 1 plus... I know it can be misleading.
Grade 1 plus - G1+.... the very best of English willow, often reserved for the manufacturers own Pro Players and utilised in such bats described as Limited Edition, Ultimate, SPS or Pro-Performance. Unbleached with straight even grains and absolute minimal marking or discolouration in the face.
Grade 1 - G1 .... top quality English Willow, used in such bats described as Pro, Original, Titanium, Premier or Players. Good straight grain structure and unbleached with minimal marking or discolouration in the face.
Grade 2 - G2 ... Unbleached English Willow with some irregular grain patterning and some minor blemishes and possible reddening in the blade.
Grade 3 - G3 ..... Usually unbleached English Willow with irregular grain pattern and some marking and discolouration in the blade.
Grade 4 - G4 ... English Willow usually bleached and often non oil with a covering to the face of the bat.