1. OEM: Any color can be customized in our factory to meet your taste. 2. QC: QC system works from the very beginning to final container loading. 5. Strict quality control and preassembly work in the factory for all the orders especially for those of special need. 5. Sample Service Samples will be offered to any customer in need of confirming quality, color and finishing before order with charged express cost which is refundable after order confirmation.Customized Quartz Countertop website:http://www.chinaktstone.com/quartz-countertop/