WIDE APPLICATIONS: The index card binder is suitable for studying, taking notes, making lists, etc. It is the best choice for school study and office records. What's more, they are great at helping you stay organized whether at home or the office. TOP QUALITY MATERIALS: Our index cards are made of thick paper, the index cards are durable, wrinkle-resistant, colorfast, smooth, perfect for writing and having no ink-bleeding issue. WATERPROOF COVER: Each ruled index card has a PVC protective shell on the front and back, fixed with the coil, and it can be unfolded out 180 degree horizontally for writing. What's more the PVC covers of the index cards play a role of waterproof and dustproof. And the cover will give the notepad a strong support when writing offhand. PORTABLE AND CONVENIENT SIZE: the index card measures approx. 3.4 x 4.9 inches/ 7.6 x 12.7 cm, and each card can be torn off separately, and applied independently, which helps in separating your notes by subject. PACKAGE CONTENTS: You will get 5 PCS index cards in 5 different colors, pink, yellow, blue, white and green. Specifications: Main material: paper Color: pink, yellow, blue, white and green. Size: 3.4 x 4.9 inches/ 7.6 x 12.7 cm Package Contents: 5 PCS index cards in 5 different colors, pink, yellow, blue, white and green.