JAM PAPER #10 Recycled Invitation Envelopes - 4 1/8 x 9 1/2 - Milkweed Genesis - Bulk 1000/Carton Milkweed Envelopes Size: #10 (4.13 x 9.5 inches) Quantity: 1000 envelopes per carton Perfect for Greeting Cards, Invitations, Weddings or any announcement. This Envelope is fashioned from High Quality 20 lb paper, has a gummed commercial flap, and a smooth finish.