Wool sponges are gentle enough to use on skin and also tough enough to use on dirty dishes. Each square is 5 " x 5" inches and about 1/4" thick, and with use, they will shrink and become firmer. Wool is naturally antimicrobial, biodegradable, and won't shed microplastics into our water system. Hooray! Take care of them by allowing to dry after each use. They will last about 1-2 months of heavy use, and then they will be good & ready for composting!