Paperworks Security Guard Rx Prescription paper performs well in all types of copiers and Ink-Jet printers. The sheet contains 5 security features: 1. A "VOID" pantograph is hidden on the surface. 2. A security prescription watermark on the back. 3. A thermochromic Rx imprint. 4. Coin-reactive ink that changes color when rubbed by a coin. 5. Invisible fluorescent fibers in the sheet. Paper is 24lb/90gsm. 500 sheets per package.