Glacier Bay Drop-in/Undermount Granite Composite 33 in. Single Bowl Kitchen Sink in WhiteGlacier Bay granite sinks are made from the most technologically advanced material available on the market containing up to 80% natural granite quartz. They are designed to combine hard working performance with great style. Durable for everyday kitchen use, the sinks are heat resistant up to 536F as well as chip, stain and scratch resistant. On trend design shape fits any kitchen decor Granite composite is durable and built to withstand day to day use