Plastic cones are fairly aggressive, but they can give a bright finish. They can be used on aluminium, brass and plastics. They are recommended for general metal removal, pre-painted or pre-plated finishing, polishing, and fast and heavy cutting. They will produce a very smooth finish, but very little shine. Plastic media is used for soft metals (brass and aluminium) or stringy materials to produce a better surface finish and to avoid rolling the burr over into a hole. This is also good for preparing parts for anodising, and the triangles are good for corners and flats. Plastic media gives the best surface quality. It does not discolour metal and does not peen over burrs. Plus, it’s 30% lighter than ceramic media. Features: Fairly aggressive, can give a bright finish, used on aluminium, brass and plastics Media: Plastic Shape: Cone/Pyramid Size: 15 x 15 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.