These are Pre-Production Prototypes which are one of a kind and contain all the features of the official Skill RDA. These colours have never been publicly available and these are the only ones ever made.
Black Anodised Aluminium Top Cap
24k Gold Plated 304 Stainless Steel Deck
4.5mm Deep Juice Wells
2 Post Design With 3mm Wide Vertically Slotted
Single & Dual Coil Air-Flow Control
6 x 24k Gold Plated Post Screws: 2 x Slot, 2 x Cross, 2 x Hex
24k Gold Plated Brass 510