Several, depending on the purpose for which you use it. You routinely used a single pad to scrub burn scars off stainless steel pots and pans. does an excellent job with little effort.

There is little doubt that the carborundum sponge will scratch fiberglass given how abrasive it is. For the intended use, it works fantastically, but not on "soft" materials like wood or plastic. It can be used to clean cast iron skillets and remove oil that has burned onto stainless steel sinks. It's also excellent for erasing defects in bisque clay if you're a potter.

It has an abrasive exterior and is likely to harm the tiles' finish.

Brown on the outside gray on the inside

This is emery

It would work flawlessly. If you don't take caution, removing a scuff could damage the paint. It only removes marks; it is not for scrubbing.

No it does not. This sponge is better suited for use with iron cookware and stoves.

To use the sponge and carborundum brush magic eraser, simply add water.
a cleaner with a variety of purposes Cut effortlessly through soap scum, grease, and "permanent" stains.
Use without scrubbing and hard work on your shoes, car, toilet, sink, walls, doors, floors, and more

Yes it is environmentally friendly. Utilize simply water to wash away stains. If the oil stain is particularly bad, using detergent products is advised.

Yes