Item: Including 20 birthday party invitations & 20 white envelopes. Dimension:The birthday invite double-side card measures 4 x 6 inches. Fill-in style. Material: Our birthday invitation cards are made of high quality writing paper, sturdy and durable. Design:Eye-catching design, thick and easy to write on with various pens. Perfect for inviting family and friends to birthday parties. Item: Including 20 birthday party invitations & 20 white envelopes. Dimension:The birthday invite double-side card measures 4 x 6 inches. Fill-in style. Material: Our birthday invitation cards are made of high quality writing paper, sturdy and durable. Design:Eye-catching design, thick and easy to write on with various pens. Perfect for inviting family and friends to birthday parties.