500 PACK SELF SEAL BUSSINESS ENVELOPES: HERKKA #8 Security envelopes are designed with Peel and Seal closure—no moisture needed and a premium security tint to protect sensitive information and a super strong SELF-SEAL strip. Perfect for home or office; securely send checks or other confidential documents..PREMIUM SECURITY CHECK TINT ENVELOPES: The interior of our No8 Security envelopes use a dark navy, heavy coverage security tint to provide guaranteed privacy for your legal or business mail, offer the protection contents and sensitive information, a security tint makes envelopes hard to see through that ensures upmost privacy..DOUBLE WINDOW DESIGN: Only addresses will show through our unique 2 window. No show of memo, Payee line or amount in windows. Ideal for Quickbooks Check, Business Check, Documents Secure Mailing. NOTICE: THESE No8 DOUBLE WINDOW ENVELOPES ARE NOT COMPATIBLE WITH QuickBooks INVOICES..EASY SEAL CLOSURE: Our No8 envelopes are designed with an ultra strong SELF-SEAL adhesive strip to create a full, super secure seal across each envelope's width that won't easily open or tear, ideal for mailing for any letter sized and larger documents without splitting..LONG LASTING SUPPLY: Large sized envelopes and 500 envelopes in every pack for a long lasting supply, perfect for everyday business correspondence and large mailing tasks! Click the Orange Button to order now.