We have (44) new excitation filters from Omega Optical. These are dichroic filters with a 635nm center-peak emission and 15nm band width. They are 1.375" (35mm) filters and are the filter glass only, no ring or carrier. We are offering these as single filters but please contact us if you are interested in multiple filters and a quantity discount. We would even consider selling the entire lot. Contact us. These are all each nicely packaged in individual, plastic, sealed envelopes.