Businesses in the paper and paperboard category manufacture, process or supply paper-based materials for printing, packaging, stationery, hygiene and industrial uses. Products may include printing and writing paper, coated and uncoated sheets, kraft paper, tissue, corrugated board and solid paperboard. Materials are commonly available in different weights, finishes, colours and grades, supplied as rolls, sheets or boards. Many suppliers cut, slit or convert stock to specified dimensions and may provide specialist grades for applications such as labels, cartons, books, displays or protective packaging. Some businesses also make finished items, including envelopes, boxes and paper bags, or advise customers on selecting suitable materials. Their customers can include printers, packaging manufacturers, retailers, offices and other businesses that use paper or board in production. Availability, minimum order quantities and processing options vary between suppliers.