This 50-pack of corrugated cardboard sheets is perfect for a wide array of DIY projects and arts and crafts creations at home or in the classroom. The 11x14 cardboard rectangles can also serve as an insert, corrugated packaging pad, or divider while shipping items to customers, family, or friends. The packing cardboard sheets can be inserted into a mailer to protect against important documents getting bent and damaged in the mail. Made from high-quality, durable materials, these envelopes are designed to protect your work, ensuring it arrives in pristine condition. The cardboard rectangles can also be used as a backing for craft projects or even make your own photo frames! You can also use them to make signs with markers or paint. Our cardboard sheets with side funneling each measure 11x14 inches and are 2 millimeters thick. Whether you're sending important documents, artwork, or anything else that requires extra protection, these envelopes are the perfect solution for keeping your papers safe and secure.