two brands at least are available.

Most well known.
3M
Burgundy = 320
Green = 600
then I get shaky.

Other brand I have.
Very green = 320
Grey green = 800
White = 1000

I love the stuff on my particles and makes plug work a dream.
Keep them very wet or you'll scratch the balls.

Always scared of using sandpaper as it would break of particles and I would see a loss of reaction.  Could often restore with Brunswick Sandpaper(trizact).

Now the reaction stays particle-y(new word).

REgards,

Luckylefty
PS I went to a Napa Auto parts and picked up pieces for .99 cents.

Set your preferences to go back to 30 days (maybe more) and you will find this information pusted over and over and etc. again.

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Don't wear your self out cutting wood with an axe...Use a Buzzsaw

7445 - White pad, called Light Duty Cleansing  - (1000) 1200-1500 grit
7448 - Light Grey, called Ultra Fine Hand      - (600-800) 800 grit.
6448 - Green (?), called Light Duty Hand Pad   - (600) 600 grit
7447 - Maroon pad, called General Purpose Hand - (320-400) 320 grit
6444 - Brown pad,  called Extra Duty Hand      - (280-320) 240 grit
7446 - Dark Grey pad, called Blending Pad        (180-220) 150 grit
7440 - Tan pad, called Heavy Duty Hand Pad     - (120-150) 60(?)

Green Scotch Brite is available EVERYWHERE. It's 600 grit.
Blue Scotch-Brite is considered to be about 1000 grit.
(The value inside the parentheses is directly from 3M.)

3M Chart

 
Less Aggressive  -------->  More Aggressive 
7445 7448 6448 7447 6444 7446 7440 
Finer Finish     -------->  Point Coarser Finish 

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"Just because you can do something does not mean you should do it."