Quality Park 500 count #10 envelopes are the perfect all-purpose mailing envelopes for letter-sized business documents. These classic envelopes fit standard paper folded into thirds. Versatile, sturdy and inexpensive enough to use for budget-conscious bulk mailing, monthly payroll, billing, brochure mailers, or to use at home as cash envelopes for budgeting, coupon sorting and more. Our basic letter size envelopes have a windowless front panel ideal for everyday uses — no need for rulers and precise window measurements as required for window envelopes. Each bright white envelope is made of 24 lb white wove paper with side seams, leaving a smooth, uninterrupted front panel for labeling, printing or hand addressing. A simple gummed moisture-activated closure seals tight. Machine insertable for inexpensive customization: run our windowless envelopes through a laser or inkjet printer or professional bulk mail equipment. Ideal for business stationery, invoices, statements, checks, marketing promotions and more. Plain #10 envelopes are a classic for a reason: economical, versatile and convenient. Every household and small business needs a supply of no window, #10 envelopes. Stock up on a never-out essential. #10 Envelopes measure 4-1/8 inches x 9-1/2 inches. 500 Per box.