The length of a product range is determined by the total number of SKUs or products that make up a specific range. For example, consider the Signal brand’s toothbrush range, which is divided into five distinct categories: classic, technical, premium, electric, and children’s. Each of these categories includes a specific number of SKUs, totaling 21 products. This concept of range length is closely linked to the breadth of the product range offered by a manufacturer or brand.