Corn Cob shells are ground into various grit sizes to be used for cleaning and polishing. This is ideal for tumble polishing of metals such as aluminium, bronze and brass. Corn Cob Media shells are extremely durable, angular and multi-faceted, yet considered a soft abrasive. The Corn Cob Media shell we supply has been impregnated with a polishing compound to acheive a superior finish. Features: Used for Fine cleaning and polishing Grade: 1 Media: Dust reduced Corn Cob Media Shell Compound: Use dry Read \" Vibratory Tumbler – The Fast & amp; Effective Way to Polish Small Motor Parts \" from our Technical Articles to know how to use and which media to choose.