This is custom designed to fit the ZWO Seestar S30 (the WHITE Seestar). What is a Dew Shield? A Dew Shield is used to reduce moisture build-up on your optics while using the telescope. A Dew Shield is also a useful device that can effectively block unwanted light from angles away from the direction of the target you are viewing - To use, simply press the Dew Shield onto your Seestar and your set. If you decide to attach additional accessories, simply press them onto the end of the Dew Shield and use as expected. - Our Dew Shield measures 2 inches in length (53mm) - Our Dew Shield is Custom 3D designed and printed using ABS. ABS is known to be very strong and resilient to temperature changes. ABS is also used in other applications including Toy Building Bricks, Sports Equipment and Automotive components - This does not include shown accessories, or the telescope. This only includes the Dew Shield. - When you are finished with your viewing session, remember to always remove the Dew Shield prior to powering down your telescope. Never power down with it attached! *This only includes (1) West Coast Astro Deluxe Dew Shield for Seestar S30, it does not include any shown Filters or Telescope. *This is a telescope accessory.