Manufacturing and delivery of 2 plane elliptical mirrors for the METRIXS beamline at BESSY. The plane elliptical mirrors focus the radiation from the exit slit to the focal plane of beamline, creating a tiny focus. M3 focusses inhorizontal direction and M4 focusses vertically. M3 is mounted in face-side orientation whereas M4 is mountedin face-up orientation M3: material: Single crystal silicon, dimensions 400 x 35 x 35 mm3 ± 0.1 mm, Geometry: Source distance 39 600 mm, Image distance 1 900 mm M4: material Single crystal silicon dimensions: 400 x 35 x 35 mm3 ±0.1 mm; Geometry: Source distance 7 750 mm, Image distance 1 000 mm The complete specification will be attached at the request for Quotation for all companies which satisfy terms of participation.