Ceramic media is best for heavy cutting and hard metals, (iron and steel). It is better at supporting very heavy parts than plastic media. Fine threads or a hanging burr can be peened over by ceramic media, whereas plastic media won\'t peen. When a small media is required, ceramic media offer the best selection. Features: Good for edges and holes so can be used to remove rust. It gives dull finish, will de-burr, used mainly on iron and steel. Media: Ceramic Shape: Triangle Size: 10 x 10 mm Compound: Use dry or with Vibro Liquid / water solution Read \" Vibratory Tumbler – The Fast & Effective Way to Polish Small Motor Parts \" from our Technical Articles to know how to use and which media to choose.