These multimode step-index silica-silica fibers have a pure silica core and doped silica cladding. They will transmit light from 500-2600 nm. For general use an acrylate coating is recommended. Acrylate coated fibers are available in sizes from 200 µm to 1.0 mm core diameter. For optical fiber light guides or higher temperatures, polyimide coated fibers are available in core diameters up to 300 µm. They have a very low fluorescence and are recommended for spectroscopy. These fibers are suitable for use across a wide wavelength range. They can be used for high power transmission and have good radiation resistance.