I bought my daughter a rock tumbler for Christmas to make polished rocks. What I didn't realize at the time was that this process takes 30 days of loud noise in the garage!! So far, we are only on day 3!! The booklet says "what nature takes 1000 years to do, you can do in 30 days". Yeah, of constant grinding noise in the garage!!! Oh well, we will have some cool looking rocks for Valentines Day!!! xoxo A.Joy