Save time and hassle when mailing with JAM Paper Open End Tyvek Envelopes. Not only do these envelopes feature a unique airmail design on both the front and back, but they are also water- and tear-resistant. Your contents will never be exposed to damage or stains and will be sent to recipients in its original state. From magazines and catalogs to documents and projects, these envelopes cater to it all. This pack contains 25 white Tyvek envelopes. Each envelope measures 9" x 12", has an open end opening (no clasp, gummed), straight flap, self adhesive strip closure, is made from 28 lb. paper, is 10% recycled, and has a smooth finish.Details:White9" x 12"28 lb/75 gsmOpen end openingStraight flapSelf-adhesive strip closure25 envelopesTyvek and 10% recycled paper