Hammermill's most popular paper among large offices and in-plant shops, where dependability is critical. Helps eliminate misfeeds, internal jams and uneven stacking, which means less downtime, service calls and missed deadlines. So reliable it has a 99.99% JAM-FREE? Guarantee. Acid-free for archival quality. This product was made from wood that came from a certified managed forest. Size: 8 1/2 x 11; Paper Color(s): White; Paper Weight: 20 lb; Sheets Per Unit: 5000.