Replacement for Jacuzzi tub graphic ring.  This is a basic model with no labels, replacing the graphic ring around the control knobs.  The internal diameter (37.5 mm diameter, 18.75 mm radius) is a little tight around my on/off push button, and the exterior diameter (51.5 mm diameter, 25.75 mm radius) is a little shy of the outer diameter, but it fits overall, providing some protection from water splash.  It also doesn't have the small and larger tabs to lock it into the control plate.  I created this due to being unavailable from the manufacturer, and other replacement parts being so expensive.