Delta's Evolution celebrates the 200th anniversary of the birth of Charles Darwin (1809–1882) and his remarkable theory of natural selection. The limited edition pens are hand-turned from solid blocks of marbled blue resin with antiqued, solid sterling silver accents. The central ring depicts the famous sketch “Darwin’s Finches” in high relief. The fountain pen has an 18K Medium white gold nib engraved with a snail shell, is a Push Button System