Each new color in the collection pays homage to its respective predecessor. The DW6900RCS-1 is black with a neon yellow dial and the DW6900RCS-4 is very hot pink with a silver dial and pink digital display. The DW6900RCS-7 is a cool crisp white with a blue dial. This collection is made of bio-based resin for the Réplicas Richard Mille rm 055 bezel and band and G-Shock has decided to use eco-friendly packaging for this release too kind of cool for a brand Réplicas Richard Mille rm 029 that is so synonymous Réplicas Richard Mille rm 21 with mass production.