Rich in Quantity: you will receive 80 pieces of library pockets in 4 different styles and 20 pieces for each style, and also matching 80 pieces of library cards, which are enough quantity to meet your needs and replacements. Size Details: library book checkout card is about 3 x 5 inches, and the envelope is about 3.3 x 5.3 inches. These library pockets and cards are made of reliable paper materials, smooth and thick enough for writing, without ink leakage. The pockets have self-adhesive function, which can firmly adhere to books and is not easy to fall off. Widely applicable: Library book pockets with library envelopes are suitable for libraries and can also be used in daycare, schools, homes, offices, etc. This library lending kit is rich and complete, suitable for you to give to family, friends, colleagues, neighbors, and people who enjoy reading. It is the ideal gift for generous readers.