Vibratory tumbling and finishing removes burs and creates a smooth surface on metal, plastic, glass, and stone. Workpieces are placed in the tumbler and abrasive media is added. When the tumbler is started, the media and parts rub together to remove burs and smooth inside recesses. Tumbling media is made of abrasive material that rubs against parts to create a smooth surface. Finishing compounds are added to the tumbler with the media to enhance results and extend media life. Vibratory tumblers debur and finish irregular and small parts. Manual separating screens filter undersized media doesn't get lodged in recesses. Centrifugal magnetic finishers use magnetic pins in a liquid solution to burnish and debur nonferrous metals.