Rediform - RED53110 High-quality laboratory notebook is crafted from a durable and hard green marble cover to increase writing stability. Its 192 pages of premium white paper with 5 x 5 quad ruling provides plenty of space for permanent records. Sturdy design ensures your journal will be well-protected and have increased longevity. Center-sewn binding allows it to lie perfectly flat. Unlike traditional notebooks, it can also be folded back and lie perfectly flat when open to create a beautiful writing surface. This notebook is perfect and very useful for laboratories, and its perfect binding adds flexibility. This notebook is made of recycled post-consumer paper to preserve the environment by cutting down fewer trees and is FSC certified. This book is printed with a vegetable oil-based ink for less impact on the environment.