Protect your most important business documents, legal correspondence and healthcare records from fraud and identity theft. Patent-protected AuthentiGuard™ is 99% effective with current scanners, copiers and fax machines. Older technology is only 70% or less effective. Hidden words appear when copied, scanned or faxed. Plain sheets look like tinted paper. White space is exposed if someone tries to erase printed text. 24-lb. acid-free sheets. 8-1/2 x 11. 250 sheets per pack.