The AstraGranite P428BL D-Bowl sink is made from a granite composite material that is comprised of 80% Quartzite and 20% Acrylic. Silver ions are added to the sink during the manufacturing process that kill 99% of bacteria on contact. Aside from being anti-bacterial, the P428BL is stain and scratch resistant and can resist heat up to 550 degrees. The overall dimensions of the sink are 24 3/4″ x 22″ x 8 1/4″ and a 27″ minimum cabinet size is required. The sink contains a 3 1/2″ offset drain and is available in multiple colors. As always, our AstraGranite sinks are covered under a limited lifetime warranty for as long as you own the sink.