159040 Grit Size: Buff Features: -Convex Wet Polishing Discs.-Convex, Hook and Loop backed discs.-Max 3700 RPM.-Diameter: 4". Color/Finish: -Disc backs are color-coded for easy grit size identification.-Item # 159033 - Grit: 60, Color: Blue.-Item # 159034 - Grit: 150, Color: Yellow.-Item # 159035 - Grit: 300, Color: Orange.-Item # 159036 - Grit: 500, Color: Red.-Item # 159037 - Grit: 1000, Color: Dark Green.-Item # 159038 - Grit: 2000, Color: Light Green.-Item # 159039 - Grit: 3000, Color: Brown.-Item # 159040 - Grit: Buff, Color: Black. Dimensions: -Weight: 1 lbs.