Beautiful collectors Cartier pen . . A true homage to the most beautiful shades that nature has to offer, this Cartier pen collection amazingly combines shades of colored finishes with the brilliance of precious metals. Gold-plated brass accessories. The clip is made of gold-plated spring-type stainless steel. Twist mechanism. Upper body in brass lacquered with multiple layers of lacquer. Lower body in brass lacquered with multiple layers of lacquer .