Gobos add mood, color effects and patterns to a background or other surface with enough reflectance to accept projection. A focusable light fixture with an optical system is required with a frame or some other means of placing it between the lens and light source. Rosco Standard Steel Gobos are made in several sizes to accommodate various fixtures. Hundreds of patterns are available.
This Rosco Nightsky Standard Steel Gobo 79005 Size E, has diameter of 1.47" (37.5 mm), and features a starry, night sky with clouds.