Orion 15097 Light Shroud for SkyQuest XX12 Dobsonian Telescope Custom-designed light shroud for the XX12 Truss Tube Dobsonian telescope blocks stray light to improve image contrast Made of opaque black, stretch nylon that fits the 12" Truss Tube reflector like a glove and fastens with elastic on both ends Breathable fabric will stay-put in light breezes Lessens accumulation of dust and dew on mirror surfaces while optimizing view contrast during use Made in the U.S.A.