The A4 Invitation Envelope (4 1/4 x 6 1/4) in 60lb. White w/Silver LUX Lining is a bright white colored envelope on the outside with a a bright, shiny silver foil lining on the inside. This envelope has an elegant square back flap and is perfect for RSVP cards, invitations, announcements, and notes. The A4 is easily sealed by a Peel & Press strip located on the back flap, and its dimensions make it the ideal 4" x 6" photo envelope. For social and invitation purposes, the A4 is also a great reply envelope as it easily fits inside A6, A7, A8, A9 and A10 size envelopes. Available plain or printed for customization, branding and creative uses, starting in small quantities of 50 to large quantities of 50,000 and more.