They can be easily be used for six months but grow weary looking ...
My third order because I give these away to friends and family; the first one I got was gifted to me. They can be easily be used for six months but grow weary looking and for the sake of prettiness I replace a kitchen  sink,  but wash and save to use and throw away nasty projects.  They have not scratched my glass cook top yet.  I  always used a dish rag for dishes or wiping down as I could add to my laundry instead of a sponge because they would always end up stinking. I toss the sponge every few weeks into my bleach load. Now I keep both the dish rag and Sterling Sponge at the sink because they both have daily uses. These sponges  have never smelled bad.
Rating: 5 stars