The inspiring concepts are: the Golden Number, the Pentagram, and the Nautilus.The Golden Number: the ratio between the length of cap and pen in both open and close conditions reflecting the divine proportion.The Pentagram: it is part of the form of the pen itself, of course adapted to the ergonomic needs of a writing instrument. The Nautilus or “Golden Spiral”: according to the Fibonacci Series, the Golden Spiral envelops the pen without braking up.Material: Black LuciteFinishing: Silver 925