The FB1200-10 from Thorlabs Inc is a Optical Filter with Wavelength 1000 to 1250 nm, Center Wavelength(CWL) 1200 nm, Bandwidth (FWHM) 10 nm, Blocking Wavelength 200 to 3000 nm, Filter Diameter 25.4 mm (1 Inch). More details for FB1200-10 can be seen below.