Wilson Jones Sheet Protectors, Heavy Weight, Top-Loading, Clear, 50 Sheets/Box (W21410) CONVENIENTLY LETTER-SIZED  Convenient sheet protectors are a standard letter size, measuring 8-1/2 x 11. SINGLE-POCKET PROTECTOR  Single-pocket sheet protector allows you to easily slide your frequently-referenced documents inside, protecting them from moisture, and wear and tear. CLEAR POLYPROPYLENE  Convenient, clear protectors allow you to easily view and display your work. Sturdy polypropylene is acid-free and archival safe. HEAVYWEIGHT 3.3 MIL  Heavyweight protectors are designed to be strong, with 3.3 mil thickness. Non-stick coating also prevents ink from smudging or rubbing off papers onto the sheet protectors. 50 SHEET PROTECTORS  Sheet protectors ensure plenty of productivity with 50 protectors per box.