4 pieces pumice stone cleaning brush block cleaning block toilet toilet cleaning blocks strong urine stone remover cleaning stone Features: Material: pumice stone Weight: 130g Size: 15×3.5×2.5cm ♥ Made of 100% natural pumice stone, safe for children, pets, plants and water, non-toxic and odorless. ♥ You can use tools to sharpen a pumice stone to clean edges and corners in toilets or other fixtures. Instructions: 1. Please moisten with toilet cleaner before use, the cleaning function is stronger. 2. Gently slide the surface of the pumice stone when using. 3. Rinse and dry after use. Customer Service: If you have any questions, please feel free to contact us. We will try our best to solve the problem for you and look forward to your visit!