JAM Paper® Copper Stardream Metallic #10 Business Envelopes measure 4 1/8 x 9 1/2 inches each and are made out of high quality, 32lb paper. This full carton contains a large and even total of 1000 envelopes. Each one features a bright and eye-catching copper color and a metallic, shining finish. To keep the items placed inside of these envelopes secure while being transported through the mail, these envelopes have straight flaps and reliable gum closures. These envelopes are the ideal size for standard sized sheets of paper that have been folded into thirds. Use them for special occasion mailing purposes!