R Exclusive, only available at Toys R Us Canada. A great set for any junior geologist or anybody who wants to learn how crystals are made This enables you use pointed crystal base to create beautiful acicular (needle-shaped) crystals used to make crystal mobiles and crystalline figures. By using gemstone crystal base (alum), you can conduct an experiment making octahedral crystals Includes 68 page science guide for more information; From the Manufacturer. Rock Tumbler, AC Adapter, Rocks, Jewelry Accessories, Key Chain, 3 Setting Holders, 18" Silver Tone Necklace Chain, 1 Pair Hanging Earring Wires, 1 Jump Ring Connector. Coarse Grinding Powder. Fine Grinding Powder. Polishing Power. Glue.