Vibration-damping optical tables with five basic performance levels are available from Kinetic Systems Inc. The tables can be customized for a specific application, and they provide flat, stiff, highly damped surfaces with high natural frequencies. They are available in sizes up to 6 × 20 ft and up to 36 in. thick. Standard tabletops have a ferromagnetic stainless steel top skin, a carbon steel bottom skin and a proprietary epoxy-bonded honeycomb core.