Protect charts, resumes, and other forms with these letter-size plastic sleeves. The corner lock feature makes it easy for these sleeves to fit documents snugly, preventing them from falling out, while the three-hole punched design lets you easily add them to binders. These Avery corner-lock plastic sleeves are transparent, making it easy to quickly identify papers at a glance without needing to go through the hassle of removing them. Sheet protectors to prevent degradation of paper inserts Clear plastic material allows for easy viewing Overall dimensions: 9.5″W x 11.75″L; hold up to 20 sheets of 8.5″ x 11″ paper Three-hole punched and ready for use Four per pack Corner-lock tabs keep documents secure Specifications table Attribute name Attribute value color & material True Color The PRIMARY material that the item is made of. Polypropylene/PP Color Family Clear Protector Sheet Capacity No Sheet Protector Durability Water Resistant Number of Holes Punched Acid content determines how long the paper or product will last before breaking down. The acid level is measured by the pH (potential of hydrogen) on a scale from 0 to 14. Acid Free (alkaline) paper has a higher pH (above 7), has a longer life expectancy, and is less likely to discolor and break down over time. Non Acid Free style Sheet Protector Type Top Loading additional details Pack Qty Yes Sheet Protector Pack Size Items of a particular grouping, as merchandised and labeled by a manufacturer Corner Lock