jam paper 10 x 13 open end catalog envelopes with clasp closure - smooth black - 50/pack jam paper jam paper black 10 x 13 open end catalog envelopes with clasp closures are ideal for multiple varieties of personal and business mailing needs! this pack contains 50 envelopes. each one is made out of smooth, high quality, 28 lb paper and features a straight flap with a reliable, easy-to-use metal clap closure as well as an optional gum closure for additional reinforcement. with their sleek and classy jet black color, these envelopes will make any mailed item appear both unconventional and professional. their 10 x 13 inch size makes them ideal for standard and slightly larger sized sheets of paper without folding or creating creases. use them to send documents, files, forms, and more! size: 10in x 13in | color: black | quantity: 50