Sistema series The Sistema series is the first series in the "four parts". As a way of creating, it expresses the core principle of P/4, namely modularity. "Main body" and "insert" are independent parts connected together by pins. This leaves unlimited possibilities for the iteration of material and shape combinations. Color: KA: black pound. Black pound is the surface oxidation of pure silver. Over time, this finish may fade, which can be seen as an enhancement. Please note that Black Sterling's photos tend to be darker than humans. Most jewellery suppliers can use "sulfur liver" to easily blacken the finish. Material: sterling silver Family: Sistema Series: Series 14 Tags: Bridge