Buckets are usually made of metal or plastic, they are round, have a strong handle and can be lidless or lidded. If lidded they should have fasteners to keep the lid tightly shut. Tight fitting lids help to keep products clean and stop them drying too quickly. They come in different sizes height-wise and if the lids are straight, can be stacked on top of each other. They can also be used for mixing products, slips, clay and glaze-base.