S640W Sunshine Undermount Porcelain Single Bowl Bathroom Sink is made with a thick Glaze Ceramic that provides you with the highest quality and purest material from a name you can trust. The expert craftsmanship of these materials prevent dirt from sticking to its surface, allowing the sink to renew and retain its bright, clean shine with every wash. Our sinks are perfectly manufactured to combine hardness and durability which will endure rigorous daily use for the rest of your life. Our glaze thickness reaches 0.6-0.8mm, while other general ceramics are only 0.3mm. Its compound mineral powders reach over 80% of the total materials, while the others only reach 50%.