Designed to installed underneath granite, quartz and solid surface countertops, this durable quartz composite sink has external dimensions of 32?L x 21?W x 9?D. Internal bowl dimensions are 15-1/4?L x 18-3/8?W x 9?D and 12-7/8?L x 16?W x 9?D. It is manufactured from our premium quartz composite material, containing 80% natural quartz crystals and pure acrylic resin. This material is extremely durable, providing excellent stain, scratch, abrasion and impact resistance. It also absorbs vibration and sound, minimizing noise when in use. All of our quartz composite sinks are heat safe up to 535F and withstand rapid changes in temperature from hot and cold water. The quartz composite material has a matte surface finish that is naturally hygienic, and simple to clean with soap and water. Both bowls have convenient rear drain locations, leaving more storage space in your cabinet below, and the 9? deep bowls provide plenty of room to accommodate all of your cookware. The tight radiused corners increase usable work space and provide for a modern look, yet are easy to clean. This practical design is available in a choice of 6 rich color choices to complement many different kitchen color palettes. All colors are UV stabilized and will not fade over time. Included with this sink kit are stainless steel bottom grids, stainless steel basket strainers and a bottle of Luster Pro cleaning oil.