The Mudsponge White Finishing is a sponge made with a tight-cell material and is less absorbent than the Mudsponge 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 Mudsponge Orange Most Absorbent pop up sponge is the perfect throwing sponge. The Mudsponge Blue Workhorse is a great all-purpose sponge made of an open cell material that is very absorbent. It is shaped like a potters rib to fit comfortably in the palm of your hand. Dyed with a natural pigment, the colour will fade with use.