Features: Product features: Safe, reliable, sturdy, durable, not easily damaged, and easy to store. Solar filter for 150mm aperture- Sky-watcher- Telescope. A must-have filter for safely observing the sun- and sunspots without damaging your eyes With this filter the sun- will be of a neutral, eye-pleasing white color. See sunspots, eclipses, and planetary transits of the Sun- safely with your telescope and this filter Made with high-quality, streak-free and blister-free Bard Astro- Solar Safety Film Specifications: Scope of application: suitable for omni150, etc Material: ABS+Composite Film Bard Film Density: 5.0 Filter Aperture-: approx 135mm/5.31in Cover Diameter:approx170mm/6.69in Suit for: Skywatcher 150/750 Telescope and So on. Package Size:approx 215MMx215MMx35MM/8.46x8.46x1.38in Weight: 141g Note: Never look at the Sun-, either directly or through a telescope, without a professionally made protective solar filter installed that completely covers the front of the instrument, or permanent eye damage could result. Package includes: 1PCx Solar Filter