Designed specifically for mailing the current HCFA 02/2012 CMS 1500 Forms. Your laser printed forms' addresses will show perfectly through the envelope window | Save time as you quickly stuff, seal, and send. Our unique right single window design is slightly larger making it easier to get the address to show through the window | Just flip the flap and seal for a strong lasting seal. Our security envelopes will quickly and easily create a strong seal for completely secure business mail. | Quickly send hundreds of medical forms with our easy to use self-seal flap that doesn’t require peeling, just turn the flap and seal. | Provides complete business mail security for your medical claim forms with our dark black security tint