A set of all Mudtool Sponges. The White Finishing is made with a tight-cell material and is less absorbent than the Blue Workhorse. It is excellent for finishing work, final detail and clean-up of surfaces and won't pull out grog or other materials in the clay body. Think of it like a chamois sponge. The Orange Absorbent is the perfect throwing sponge. More absorbent than the White Finishing and the Blue Workhorse. The Blue Workhorse is a great all-purpose sponge made of an open cell material that is very absorbent. We've shaped it like a potters rib to fit comfortably in the palm of your hand. Dyed with a natural pigment, the color will fade with use.