Brass Polish Media (Stk # 518)

Treated crushed Corn Cob for use in a Vibratory Tumbler. This
media removes only tarnish and oxidation without scratching. When
used in a vibratory tumbler, it will bring metal objects to a
gleaming finish in just an hour or two. Media is reusable. When
action becomes too slow to be effective, replace 25% of media
with new. Also works well in rotary tumblers.