Red #10 Envelopes - 50 Envelopes - 9.5" x 4.125" - Standard Flap Red #10 Envelopes - Great for Christmas, Valentines Day, & Patriotic Holidays Red #10 "Business Size" Envelopes measure 4 1/8" x 9 1/2" Made from 24lb Bond / 60lb Text Red Paper Stock Inkjet, Laser, & Copier Compatible 50 Envelopes per pack