Circular Floor Pads for Scrubbing, Polishing, Stripping and Burnishing.

White will always be the softest followed usually by red which is a very common pad for general daily cleaning.  Blue and green are usually next, and these are often used in top scrubbing of floor finishes.  Black stripping pads are at the rough end of the scale, and then there are specialty stripping pads that are very abrasive for use in removing very stubborn floor finishes or sealers.