Pumie is a professional product used to maintain commercial, industrial, and institutional washroom facilities. Cleans through gentle abrasive action. Rubs out toilet rings in seconds. Rids porcelain bowl of rust and lime build-up. 100% natural pumice. Ready-to-use. Unexcelled for removing stubborn stains and unsightly rings from toilet bowls. Cleans when the strongest acid cleaners fail. Contains no active chemicals or harsh detergents. Stone reinforced. Shapes easily to flat and curved surfaces. Safe for hands. Safe around children and pets. Safe for the environment. Stone size: 5" x 1-1/4" x 1-1/4".