A screen is a small metal filter used for keeping ashes and plant parts out of the piece itself but also to keep them away from the users mouth. We consider screens to be something essential in every smoker’s house no matter if you use a pipe or bong. There are a couple of different models and sizes but usually you find them in sizes between 10 and 25mm for good prices. Since the price is so low we recommend you to try a couple different models so you find the best one for your preferences. If you ever run out of screens and don’t have time to wait for an order a classic is to simply put one or a couple small stones in the bowl which works pretty well while you wait for your delivery!