The B-Size Glass Gobo Holder is a precision accessory designed for use with ETC Source Four and Source Four Zoom fixtures. It accommodates glass gobos with an outer diameter of 86 mm and an image area of approximately 60–64.5 mm, supporting a maximum thickness of 2.2 mm. Constructed from durable metal or aluminum, depending on the model, the holder ensures secure placement and optimal alignment of gobos within the fixture’s optical path. This component is essential for projecting high-resolution patterns and textures in theatrical, architectural, or event lighting environments. Its compatibility with standard ellipsoidal fixtures makes it a reliable choice for professionals seeking consistent performance and easy integration.