This is a tube for protecting B3 size posters. Set of 3. The tube is made of thick cardboard material, about 1mm thick, and is quite sturdy. Size: Diameter: Approximately 5.0cm Length: Approximately 37.5cm It will protect B3 size posters, and is also useful as a material for summer vacation crafts. It will be protected in a plastic bag and shipped by regular mail (non-standard size). Shipping will be from the post office, so it will only be shipped on weekdays during the daytime.