Arbe's Super Finish Magnetic Tumblers have a small foot print but do big things. A heavy duty motor provides robust power while the faceted bowl maximizes rotational action. Exclusive magnetic head design also incorporates vertical pin action allowing the finisher to add high polish finish on many pieces including filigree work. The bowl holds 8 rings per batch using 60-70 grams of stainless steel pins designed to achieve a high shine finish even in hard to reach places, this finisher includes 65 grams of 0.5mm x 5mm stainless steel pin media. In addition to all the peace of mind their design upgrades give you, each magnetic tumbler is backed by a manufacturer's' 1 year warranty.