INCLUDES 20 Monster Party Birthday Invitations and 20 White Envelopes. LARGE SIZE - 4.5" x 6" with plenty of room to write your party details. TWO SIDED - Fun Monster Design on Both Sides of the flat invitation. THICK PAPER - high quality thick paper thats uncoated so you can easily write with any pen without smears! Fun and Colorful Monster Party Invitations for Kids!