The F10-1550.0-3-25.0M from CVI Laser Optics is a Optical Filter with Wavelength 750 to 1900 nm, Center Wavelength(CWL) 1550 nm, Bandwidth (FWHM) 10±2 nm, Blocking Wavelength 3500 nm, Filter Diameter 25 mm. More details for F10-1550.0-3-25.0M can be seen below.