The Crystallite Series PL-175 Granite Composite double bowl sink is made with 85% natural quartz which is the hardest constituent of granite. This is coupled with a high-grade acrylic binder, resulting in a beautiful sink that provides extreme durability. These sinks are UV Stable as well as scratch, stain, impact, and heat resistant. Every sink features a natural anti-bacterial hygiene protection system that uses silver ions to prevent the growth of bacteria and fungi. Manufactured exclusively in Germany, our Crystallite Series granite composite sinks are all made from long-life, environmentally sound materials. The PL-175 can be used for either top mount or under mount installation. Color matching strainers as well as bottom grids are available for this product. The Crystallite Granite Composite Sinks carry a limited lifetime warranty for as long as the original purchaser owns the home the sink was originally installed in.