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 Envelope is ideal for all business, professional and personal correspondence. Designed To Fit computer business checks, QuickBooks checks. Double Window, Security tinted for added privacy and confidentiality. Moisture activated gummed seal Premium 24 LB - Color: White - Finish: custom designed for QuickBooks Perfect fit, so checks won't move in the envelope. Thick paper makes it really secured and confidential with flawless seal. Memo line and amount line are fully covered.