Fire Hyperglow really is "The Heat", during daylight it is a nice red color. After a few minutes of light charge you get a "Fire orange/red" glow in the dark that is visible for hours. Radius style LBS button made from the high performance glow in the dark acrylic composite product "Hyperglow". These are charged by light and continue to visibly glow for hours. Fits all Strider knives and many other knives that take the 3/8" diameter "Hinderer Lockbar Stabilizer" button.