JAM Paper bulk 4" x 9.5" white commercial window envelopes are perfect for business and personal use. Simply insert invoices, statements, letters, and more without having to address each, as the window does the job for you! Staying both business appropriate and versatile has never been this easy.Details:White4.125" x 9.5"Available in multiple countsMade from 24lb. paperSmooth finishBooklet openingStraight flapGum closure