Material: The pottery sponges are made of hardwood and two different densities of polyurethane (PU) sponges. They are soft, flexible, absorbent, washable, and . The hardwood structure is stable, to breaking or bending, and , ensuring long-term use. Included: You receive six pottery sponges in two different colors, black and yellow. The sponges are secured with a wooden stick, making them difficult to separate even at high speeds, preventing scratches on your handicrafts. Versatile: The two colors of pottery sponges have different densities, with the yellow sponge absorbing than the black. Both colors offer excellent water absorption. The long stem of the pottery tool allows you to insert it into pottery to clean residue or smooth the inside. It also easily absorbs water or stains from narrow-necked pottery, making cleaning details easier and more efficient.