elago Aluminum Portfolio Extension Set-[Extra 20 sheets][Large Extension screws 4pcs] Letter & A4 size compatible Overall dimensions are 10 x 12.5 x 0.6 inches The Extension Pack is purchased, content stored can extend to 40 pages. Made of PP, and a thickness of 0.1mm, everything stored will have protection and clear visibility Durable sheet protectors are not easily wrinkled.