6” - 8.25” UV Reactive Uranium Glass Solid Sterling Silver Vaseline Yellow & Blue Bracelet Size: adjustable from 6” - 8.25” Clasps marked 925 Solid Sterling Silver Wire New Fabrication by TheButterflyBabe Reactive under 395nm* *PLEASE NOTE: Color of glass and glow may vary slightly from photographs due to variations in screen hues and nm of black light used to produce glow. The type of Ultraviolet light and the color of visible light is determined by its wavelength. The unit of measurement for light wavelengths is the nanometer (nm). Ultraviolet light is generally considered to be from 200 nm to 400 nm.