S=A2 (4.25""x5.5""), M=A6 (4""x6""), L=A7 (5""x7"").Blank Cards and Envelopes Set includes 100 pieces of 8.5 x 5.5 scored cardstock (4.25 x 5.5 when folded) and 100 A2 self-seal envelopes for Diy greeting cards, invitations, birthday cards, photos, thank you cards, and more. Made of heavyweight 110 lb/300 gsm white cardstock with 120 gsm envelopes, acid-free, no see-through. Compatible with laser, inkjet and copier printing. Completely blank on both sides for personalized designs. Pre-scored for easy folding without cracking. weight: 1.45 pounds.