SKYZONAL 1.5X 2X 2.5X 3.5X Replacement Glass Lenses for SKYZONAL Headband Magnifier (Pack of 4Pcs) Replacement lens plate for SKYZONAL headband magnifier which provides hands-free magnification and viewing for a variety of applications such as jewelry-making, watch-making, needlework, artwork, electronic inspection, book-reading, print inspection, and stamp-collecting. Four dioptric strengths (1.5X 2X 2.5X 3.5X). Optical grade glass lens plates polished into a precise prismatic lens. Interchangeable. SkyzonalTM is a US registered trademark protected by the US Trademark Law.