Change rough stones into beautiful, polished gemstones with this U.L. listed heavy duty Rock Tumbler. Includes rock tumbler, transformer, bag of rock, bag of accessories, bag of coarse grinding powder, bag of fine grinding powder, bag of polishing powder, bag of final polishing power, glue and instructions. Same process used by the oceans for millions of years! Intended for children ages 8 years and older. # Pieces In Set: 10 Included: 50 Rock(s) Learning Skill: Science Power Source: Plug-In Recommended Ages: 8 Years And Up Measurements: 5.9 Height/Inches, 9.4 Width/Inches, 11.4 Length/Inches Assembly: Assembled Base Material: 90% Plastic, 10% Rock Care: Wipe Clean Country of Origin: Imported p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px Calibri; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} WARNING: CHOKING HAZARD – small parts. Not for children under 3 years.