Lyman Medium Natural Corncob Reloading Media (3.5 Pounds) Corncob media is a proven, and effective choice for cleaning dirty and tarnished brass cases Only a few hours of tumbling provides a clean, polished case that is ready for the reloading process Add Lyman's Turbo Bright Brass Polish to this media for best results Media is reusable for multiple tumbling cycles Proper brass cleaning extends the life of cases and reloading dies