Astracast displayed composite sinks featuring a real stone appearance at the KBIS show. Two collections of composite sinks are offered, ROK™ and Quartz. ROK, Astracast's line of granite sinks is made from 70% silica stone and 30% acrylic to give the sink its textured feeling. The sinks are lightweight, the heaviest weighing in at 38 lbs. Quartz is the company's line of quartz sinks made out of 65% silica quartz and 35% acrylic, giving the sink a high-gloss finish. The heaviest Quartz model is also 38 lbs.Astracast.