Desktop Publishing Supplies Brand White A1 Envelopes fit small notecards and everything 3 1/2" x 5" or lower! These White A1 Envelopes are made from a 28lb bond / 70lb text (105 gsm) white paper stock and are inkjet and laser printer compatible. Our white A1 envelopes <b>measure 3 5/8" x 5 1/8" each</b> and <b>feature a square flap</b>. <br /> <br /> <b>100 Envelopes</b>