QuartzLine filters are made of 99.9% pure quartz glass for unmatched durability and optical clarity. The oversized brass filter frames run smoothly and are designed to withstand your roughest adventures. With optical coatings for a hyper-neutral color profile, near-perfect transmission, and multi-coatings for enhanced scratch resistance, water resistance, anti-reflectivity, and reduced vignetting in wide-angle shots, QuartzLine filters let content developers let lifelike colors shine their final product, from the most extreme locations on the planet. Each filter includes a microfiber lens cloth, soft filter bag and filter housing.