Quality Park® #10 Envelopes are great for special occasions and holidays. Each 60-lb offset paper envelope is 4.13 x 9.5 inches with a moisture seal commercial flap and traditional diagonal seams compatible with automated inserting and 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.