Maryton Professional Cleaning Tools ,The pumice sticks can be used to clean the sink,swimming pool,toilet and greasy grill and so on.Made of pumice,odorless and nontoxic.When cleaning the swimming pool,do not soak all pumice sticks in the water at once,which dissolves quickly. These pumice sticks are made of good material that is odorless, do not absorb the grease and gunk, safe for people, animals, plants and water; It won't scratch your ceramic tile and metal; Easily solve your stains and problems.