Color: Yellow Size: #10 (4.13 x 9.5 inches) Quantity: 25 Envelopes per Pack These window envelopes allow addresses and recipients to be seen without having to address the outside of the envelope. Great for paychecks, bills, invoices, statements, marketing materials and more They are fashioned from 30% recycled high quality 24 lb paper, have a gummed commercial flap, and a smooth finish!