This durable top spiral 6 x 9.25 notebook is perfect for any all-weather situation. The binding is Wire-O. impact resistant. and rust-resistant. Theres plenty of room to record your data or simply reflect on the days adventure. The top spiral notebook has a convenient drill hole so you can hang it nearby. The rugged Polydura cover holds 100 pages (50 sheets) of the universal page pattern. making it easy to use for notes or scaled drawings.