Approximately 19mm white plated Britannia pewter TierraCast® hammertone round links. 1.9mm thick, 14mm inner diameter. TierraCast provides affordable, quality components that compliment a wide range of jewelry designs. White-plated components are generally grayer, but also more durable, than silver-plated components. White plating is also known as "imitation rhodium" and "silvertone".