Polish rough rocks to create semi-precious gemstones, add findings to make keychains, rings, earrings, charms, necklaces and pins. Tumbler includes tumbling machine with barrel, tumbling grit, polish, findings, glue, instructions and rough rocks, including: amethyst, jasper, agates and others. UL Listed 63B2 0.15 amps. Rating 110 - 120 V.A.C. 10 watts, 60 Hz. Recommended for ages 10 and up - as with all electric products, precautions should be observed during handling and use. Refill includes 8 ounces of rough semi-precious stones, tumbling grit, polish, glue, and jewelry findings.