The Blue Workhorse is a great all-purpose pop-up 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 colour will fade with use. Natural sponges have been used by potters for years. However, the quality of natural sponges can be unpredictable and we try to be environmental conscious about what materials we use and the long term effects. Our Mudsponges are made of a biodegradable and environmentally friendly material that is incredibly durable. Your Mudsponge comes to you compressed for economy of space and for the fun of watching them expand when introduced to water.