When a sleeve is used as the decoration, a thin tube of plastic is applied to the product. The sleeve is shrunk by means of steam heating or an electric radiant heater, so it fits the item’s shape. Sleeves can go over the shoulder of the article and can also be applied to round and non-round parts. PET and OPS are used as sleeve materials. Special packaging design shapes can also be decorated using sleeves, and gravure, offset, and flexo printing are all design options for the sleeve.