500 Check Envelopes, Double Window Security Confidential Tinted Envelopes for QuickBooks Checks, Business Laser Checks, 24 lb, 3-5/8 x 8-5/8-Inches, Box of 500 Envelopes - ABC Printing Double Window Security Tinted Envelopes great for Business Checks, QuickBooks and Laser Checks. Envelope is ideal for all business, professional and personal correspondence. Memo line and amount line are fully covered. 24 lb., 3-5/8 x 8-5/8-Inches, 500 Envelopes (ABC-91663-500) per box. Perfect fit, checks won't move in the envelope.