#10 window security tinted business envelopes for standard mailing. Your business is too important to leave the details up to chance. Quality Park offers you many options for your mailing and shipping needs. These envelopes feature fully gummed flaps and provide a secure seal. 24 lb. bright white stock and contemporary side seams give mailings a professional look. Our blue security tint keeps contents confidential while in the mail stream. Purchasing envelopes will be at a minimum with the convenient 500 count giving you more time to concentrate on business. Quality Park envelopes are the obvious choice for your business. See our array of other envelope options to fit your business's needs!