I bought these based on the chart below which I found online. They seem to scratch the aluminum a bit, but I think I prefer sandpaper for metal prep at the moment. That being said, the product itself is great and looks like real Scotchbrite pads. Light Cleaning Pad - (1000) 7448 - Light Gray, Ultra Fine Hand - (600-800) 6448 - Green, Light Hand - (600) 7447 - Maroon, General Purpose - (320-400) 6444 - Brown, called Extra Duty - (280 -320)7446 - Dark Gray Disc called Blending Pad (180-220)7440 - Tan called Heavy Duty Hand Pad - (120-150) Green Scotch Brite Available widely. It's 600 grit. Blue Scotch-Brite is considered to be around 1000 grit.
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