Magnetic tumblers are an automated polishing process that virtually eliminates cyanide bombardment, the need for stripping and pulsing. The tumbler is driven by powerful rotating magnets in the base of the finishing bowl. The entire precision polishing process is completed within 30 minutes, just put your jewelry, steel needle, water and special polish in a bowl and press a button The polishing process is designed to polish intricate details, tiny cracks, multiple , but uneven surfaces., Manufacturer: ZXZZAS