This EKSMA Optics mirror is a protected silver plano-convex spherical mirror, designed with a base shape of a circle and a diameter of 25.4 mm. The mirror's thickness at the center is 6 mm, and it has a focal length (EFL) of 100 mm. The mirror's front surface is coated with EKS 0025protsil 4000, a protected silver coating, optimized for a wavelength of 400 nm. The mirror's curvature is defined by a radius of 200 mm, making it a convex mirror. This mirror is made of N-BK7 Schott, a popular optical glass known for its excellent optical properties. According to the vendor, EKSMA Optics, this item is currently in stock and available for purchase. For more information, you can visit their website at https://eksmaoptics.com/optical-components/metallic-mirrors/protected-silver-mirrors/.