Quality Park #10 Envelopes are great for special occasions & holidays. Each 60-lb offset paper envelope is 4.13 x 9.5 inches with a moisture seal commercial flap & traditional diagonal seams compatible with automated inserting & folding equipment. These business envelopes will stand out from the crowd so your special invitations or client promotions get noticed. Seam Type: Diagonal; Flap Type: Commercial; Trade Size: #10; Security Tinted: No.