158908 Grit size: Black Buff Features: -4" Professional Resin Polishing Discs.-Flexible, Hook and Loop backed polishing discs.-The Hook and Loop backing allows for fast disc changes.-Max RPM: 3700. Color/Finish: -Designed to achieve a scratch-free highly polished finish on all straight or contoured granite and marble edges.-Disc backs are color-coded for easy grit size identification.-White buff pad is used for final buff on light colored stone to prevent marking material.-Item # 158901 - Grit: 50, Color: Blue.-Item # 158902 - Grit: 150, Color: Yellow.-Item # 158903 - Grit: 300, Color: Orange.-Item # 158904 - Grit: 500, Color: Red.-Item # 158905 - Grit: 1000, Color: Dark Green.-Item # 158906 - Grit: 2000, Color: Light Green.-Item # 158907 - Grit: 3000, Color: Brown.-Item # 158908 - Grit: Buff, Color: Black.-Item # 158909 - Grit: Buff, Color: White. Dimensions: -Weight: 1 lbs.