Opal glass is one of the interior diffusers available for Mola lights. Transporting the lights, or just day-to-day use can create vibrations that loosen the spacing rods that hold the opal glass in place, causing them to shift or bend. The Mola Opal Glass Stabilizing Ring prevents the spacing rods from shifting or bending. The ring keeps the opal glass securely in place at all times, and can be used with opal glass 7.125" to 7.250" in diameter.