This set includes three 3.75" x 2.25" ceramic sponges. Each color has a different texture and application. The blue is thinner, very flexable, with large pores resembling a kitchen sponge in texture. The orange is a bit more rigged/firmer, with less pores, and a tad thicker body. The white has a very smooth texture with no visible pores. These sponges are excellent for smoothing rims and edges without raising grog.