This is the Scubapro Hydros Pro BC Color Kit - 9 Colors AvailableFeatures: The color choices also let you match your BCD to your Seawing Novas for maximum equipment color coordination. By keeping a selection in your dive bag you can change colors to suit the days dive. Color kits attach quick and easy. Seven vibrant colors to choose from. Customize your HYDROS PRO with separate color kits that allow you to change up your dive style whenever you want.