The benchmark in reliability and robustness is now even harder - the DS4 Tungsten, only from Apeks. The Tungsten version of the DS4 first stage takes one of the worlds most robust first stages and coats with a high tec alloy of Chromium, Titanium and Zirconium. The DS4 Tungsten is therefore extremely hard and extremely smooth, this helps resist pitting and therefore stops the brass from corroding. The Tungsten DS4 also looks pretty damn cool as well.
The DS4 Tungsten first stage is balanced, dry sealed for excellent cold water performace and is very compact.
The XTX200 Tungsten Second stage is balanced, lightweight, compact and feature rich.