5 in x 1-1/4 in x 1-1/4 in. Professional grade. 100% natural pumice. Safe for porcelain bowls. Safe for the environment. No added chemicals. Odor free. Stone size. Pumie is a professional grade product designed for both home and commercial use. Removes rust, lime, stubborn stains and unsightly rings from toilet bowls and other hard surfaces - in seconds. Cleans through gentle abrasive action. Shapes easily to the contour of any surface. Cleans when the strongest acid cleaners fail. Contains no added chemicals or harsh detergents. Safe for hands. Safe around children and pets. Safe for the environment. Produced in the United States.