The redesigned C370 now features optional diver-changeable color frames, available in six colors, so you can personalize your regulator in seconds. The MK11 EVO/C370 is a compact, dependable air delivery system that makes diving fun, wherever your travels take you. The balanced diaphragm MK11 EVO features an innovative double spring layout, forged brass body with thermal fins and protective plastic bumpers to ward off scratches. The compact C370 offers convenient user controls including a diver-adjustable inhalation effort knob, a coaxial dive/pre-dive lever and a large, easy-to-activate purge button.