Lab research notebook with Pressboard covers is ideal for lab work and documenting results. Included carbons allow you to create an instant duplicate as you accurately record data. Notebook contains 100 numbered sets (white/canary). Canary duplicate sheets are perforated for easy removal. All sheets have a four-square-inch rule printed on the front only and are three-hole punched for easy transfer to a standard-size binder. Sewn binding keeps pages intact and allows cover to lie flat for easy use.