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If you still send data and invoices via snail mail, you should know which type of envelopes are appropriate for a small business.
Small envelopes are not considered professional. Folds should be tri-fold only, leaving only two creases in the paper. The standard business envelope is a #10 envelope.
A #10 envelope is 4-1/8" x 9-1/2". It is the most common business envelope size and is commonly used for standard 8-1/2" x 11" sheets of paper. Security tint is extremely important if you want to protect the recipient's privacy. Look for #10 envelopes with security tint if you are in need of sending snail mail to your customers.