Dualside pet sheets are a type of pet sheet that feature a smooth, glossy surface on both sides of the sheet. PET, or polyethylene terephthalate, is a type of plastic commonly used in the production of packaging materials, such as bottles, containers, and sheets.Dualside pet sheets are often used in a variety of applications, such as food packaging, display cases, and graphic arts. The glossy finish on both sides of the sheet provides a high-quality, professional appearance, making it ideal for products that require visual appeal.