Vibratory bowls can be made in a variety of material like cast aluminium, mild steel, stainless steel, polyamide, etc. Each of these materials has certain advantages as well as disadvantages. Bowls made of mild steel are not long lasting due to rusting and not so wear resistance. Over time, their performance deteriorates drastically. Aesthetic wise too, it does not look good. Hence, it is not recommended to select mild steel bowls.