S=4.375x5.75 in,M=5.25x7.25 in,L=5.75x8.75 in.100Pcs envelopes, 4.375 x 5.75 inches, perfect for A2/4x5 cards. Suitable for wedding Rsvp, birthdays, showers, announcements, graduations, holiday cards, party invitations, letters, handmade cards and business use. Made of 120 Gsm - 32lb Bond/80lb Text paper, thick enough to prevent see-through. Quick self-seal design, no moistener or licking needed, strong adhesive for secure closure. Modern square flap style with smooth finish. weight: 1.19 pounds.