Supremex 1040440FSC Outside Side Seam Business Envelope - Business - #10 - 9 1/2" Width x 4 1/8" Length - 24 lb - 500 / Box - White

No. 10 envelopes offer a smooth seamless interior for perfect insertion every time. With this design, you'll have no catching on seam while inserting so it reduces jamming and downtime. Easy-to-use envelope has an open side and outside side seam. Envelopes meet Canadian and U.S. postal standards.