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The package includes 50 sponge, the measurements of a sponge is 10cm x 6cm x 2cm. The sponge is meant for cleaning different surfaces either with water, detergent or dry. The sponge is made of open-cell melamine, the cells are very tiny and it works almost like extremely fine sandpaper. Because of the reticulated foam bubbles interconnect, its structure is a 3D network of very hard strands, when compared to the array of separate bubbles in a material such as styrofoam. Rubbing with a slightly moistened foam may remove otherwise "uncleanable" external markings from surfaces. For example, melamine foam can remove crayon, marker pen, and grease from painted walls and wood finishings, plastic-adhering paints from treated wooden tables, and adhesive residue and grime from hubcaps. If the surface being cleaned is not sufficiently hard, it may be finely scratched by the melamine material giving the surface a shine.
The point of this sponge is that you don't have to use detergent separately. The stains are removable with water or just a dry sponge. I have used a mild detergent just to speed up the process. It works the best on smooth surfaces like plastic window frames, sink, sink faucet, mirror, etc. You should not rub your skin with it, you can't feel anything at first, but it will turn red later. You could also wash dishes with the melamine sponge. I had a pot that has turned brown from the bottom in time. The first sponge didn't do much anything, the second time there was some results and with a third sponge the pot was looking like a new one. I would use these sponges to clean pots and pans every half year, to get a constant shine. After a single use the sponge looks ragged and is not looking nice next to the sink. Generally you can use a single sponge to wash som dishes and pots, clean the work environment and stove in the kitchen and also wipe walls where there are food residue and then the life of a single sponge is already over. So you it lasts about one cleaning cycle, then it has lost all fluffiness and has been teared. The foam wears away, rather like a pencil eraser, leaving behind a slight residue which can be rinsed off. Although you don't mind the quick wear, you can get them cheap by 50 in a bulk. For an example I used it on old silverware and I went through 5 sponges. The spoon sides just ripped the sponge apart. I would definitely recommend these to people who don't want to only use detergents.