JAM Paper #10 business envelopes are made out of smooth, high quality, 24lb paper. Each one features a straight flap with a reliable gum closure. There is a total of 50 envelopes in this pack. These #10 envelopes are ideal of three-times-folded standard sized documents. They are an excellent choice for mailing letters, checks, invoices, announcements, promotional materials, newsletters, and more! Use these envelopes for home, office, or special occasion mailing purposes! Details:Available in multiple colors4.125" x 9.5"24 lb. paper50 envelopes