PACKAGE & SIZE - Each pack comes with 20 birthday invitations greeting cards and 20 matching envelopes. Our birthday invitations measure 4” x 6”, designed with enough space to fill in. PREMIUM QUALITY - These Birthday party invitations made of high-quality heavy card stock, thick and easy to write. Matte card stock for easy fill in with any pen type.Ink from any type of pen or marker will not smear or run. DESIGN - The double-sided party invitations cards are personalized design. The cards are printed with vivid and vibrant colors. BIRTHDAY PARTY SUPPLIES - These birthday invitations are great choice for boys or girls to invite their good friends to join in birthday party. IMPRESS YOUR GUESTS - Our simple and elegant one of a kind invitation card comes with easy simple invitation format. Invite friends and families with these exclusive one of a kind invitations cards and make an unforgettable party!