This high-tech tumbler transforms rough rocks and minerals into smooth, shiny gemstones. It is great for making decorative accessories or gifts. Tumbling machine comes with 1/2 lb. of rough rocks. The grinding powder duplicates nature´s erosion process, delivering a smooth finish. Includes two key chains, two necklaces, rings, earrings and glue. Instructions on how to find polishable rocks outdoors are included. It is approved by Underwriters Laboratories — the worldwide trusted source for product compliance. It includes a two-month manufacturer´s warranty.