Product Description Semi-permanent lens covers with Scotchgard coating to help protect 3M Ultimate FX Full Facepiece Reusable Respirator Series FF-400 lens. For temporay use. From the Manufacturer The 3M™ Semi-Permanent Lens Protector FF-400-17 helps shield the original lens of the Ultimate FX Facepiece Reusable Respirator Series FF-400. This temporary lens comes with a perimeter adhesive that seals firmly to the facepiece lens, yet removes cleanly without any residue left behind. This product can protect the investment made in respiratory equipment. This semi-permanent lens measures 10.7 inches wide by 8.5 inches high and weights 0.5050 lb. For more than a century, 3M has applied innovation and technology to improving our customers’ lives and supporting their business goals. Today the company, from its headquarters in St. Paul, Minnesota, serves industrial and commercial customers and consumers in nearly 200 countries. Occupational Health and Environmental Safety products, focused on worker safety, include respirators, hearing-protection products, air-monitoring devices, environmental-safety products, and comprehensive training programs. The 3M brand, across thousands of products, represents consistency, superior quality, and value.