A2 Envelopes - White - 4 3/8 x 5 3/4 (for A2 cards) (pack of 100) Envelope Size: 4 3/8" x 5 3/4" Fits Card Sized: 4 1/4" x 5 1/2" 80lb paper weight (premium quality) Square Flap (gummed) bright white (96 brightness)