The Laowa 100mm Magnetic Filter Holder System was designed for perfect compatibility with the Laowa 10-18mm Lens. The Magnetic Filter Holder System holds up to 2 pieces of 100mm-wide filters. An aluminum construction gives you peace of mind knowing that your lens and filters are sturdy and strong. The 100mm Magnetic Filter Holder System for Laowa 10-18mm Zoom Lens includes the 100mm magnetic filter holder and 100x150mm magnetic filter frame. Superior Design The 100mm Magnetic Filter Holder System for Laowa 10-18mm Zoom Lens rotates 360 degrees for ease of use and maneuverability. Constructed from a lightweight aluminum design, the filter holder system was built to last. The filter holder system holds up to 2 pieces of 100mm filters.