The A2 Invitation Envelope (4 3/8 x 5 3/4) in 60lb. White w/Red LUX Lining is a bright white colored envelope with a smooth finish on the outside and a lavish, shiny red foil lining on the inside. This envelope has a stylish square back flap, and is perfect for invitations, greeting cards, thank you cards, and is ideal for letters as it's designed to fit quarter-folded sheets of paper. Since the A2 envelope fits inside all larger "A" envelope sizes it's commonly used as an RSVP and return envelope, as 4 1/4 x 5 1/2 flat and folded cards fit inside. This A2 size envelope is easily sealed by a Peel & Press strip located on the back flap. Available both plain and printed for customization, branding and creative uses, starting in small quantities of 50 to large quantities of 50,000 and more.