BathStone environmentally friendly cleaning blocks provide powerful, effective, and safe cleaning for hard water, soap scum, rust, mineral build-up, mold, and mildew while contributing to a healthy environment, BathStone is made from recycled materials and saves the equivalent of 1 glass bottle from being added to landfills per stone, Non-toxic, chemical free cleaning, Safe for your whole family, Works great on a variety of bathroom surfaces, Wont hold bacteria or viruses like sponges scrubbers, Say goodbye to hard water stains, mildew, soap scum and other buildup, BathStone a superior porcelain cleaner, , Now with sponge top, One block is 4""L x 2""W x 2""H, We feel this is the best hard water stain remover on the planet, 3 Pack, SKU: ERSI006