These envelopes are made of pliable yet damage resistant plastic. They are perfect for standard sized documents and papers. Their hook and loop closures ensure that they stay closed tightly and can be opened with ease! Use them to sort and protect your documents against bending and tearing. Stay organized by color categorizing your papers with this multi-color set! Details: Assorted colors 9.75" x 13" overall size Sides expand up to 1" Fits standard sized sheets of paper 12 envelopes Booklet with hook and loop closure Pliable Plastic