These envelopes are made of durable, yet pliable opaque plastic and features a secure, two button and string tie closure. As they are a little smaller than a standard piece of paper, these envelopes are made to fit smaller documents and checks. Take advantage of this multicolored set by color categorizing your documents for better organization! Details: Assorted colors 6.25" x 9.25" 1.25" width expansion Set of 12 open end envelopes Fits smaller documents and checks Button string closure Plastic