Walnut 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. Walnut shells are extremely durable, angular and multi-faceted, yet considered a soft abrasive. The Walnut 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 Walnut Shell Compound: Use dry