Usage Tips:20Pcs Watch Glass Polishing Kit with Scratch Removal Pads Cerium Oxide is the best polishing powder to glass scrach because the chemical and physical reaction. one strip of Masking tape ,to prevent water inside cellphone or watch , protect / cover the area no need polish. Easy to use,just mix powder with water and apply to the glass surface with the polishing felt to restore lightly scratched windows, mirrors, watch,even car headlights to like-condition. Name:Felt polishing wheels Kit Type:Watch glass polishing powder Type:Glass scraping polishing pad How to use: 1. Clean the area you're going to work on thoroughly. Be sure there is no dirt or grime on the glass. 2. Have two small plastic tubs ready; quart or pint sized containers work well. Fill one halfway with water. 3. Place your polishing wheel into the water; let it become thoroughly damp, but not dripping wet. 4. Put some of Cerium Oxide into the empty tub, and add enough water to create a slurry (a thin, paste-like mixture). 5. Attach the dampened polishing wheel to your electric drill and dip it into the slurry. 6. Place the polishing wheel on your work area, use small size felt wheel if scrach is near corner of windows,keep the wheel moving in an up and down and circular motion. Notice: Be sure that the slurry does not dry up, as this could cause your glass to overheat and crack. If your slurry is becoming dry, you can spritz it with a spray bottle full of water. Colour:As Shown Material:Felt + polishing sandpaper Package Contents: 1 x 20g cerium oxide powder 1 x backing plate 2 x rayon felt polishing pad 3 x Felt polishing wheels 12 x sandpaper (150 x 3, 320 x 3, 1000 x 3, 7000 x 3) 1 x Masking tape Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.