1)Material: The birthday party cards are made of high quality heavy card stock, thick and easy to write; vibrant and durable, eco-friendly material. 2)Design: Exclusive watercolor style design with high resolution double-sided printing, cute design perfect for kids. 3)Quantity: Each pack includes 20 cards and 20 matching envelopes, let's start the unforgettable party with these adorable invitation cards. 4)Dimension: Each card measures 4"W x 6"L, perfect size for kids and with enough space to write the information out.