• Design and implementation using state of the art technology CAD/CAM CNC code. • High precision engineered to strict specifications • Metal parts made of inox steel type 316L marine • Inox ball bearing wheels • High endurance, low friction Industrial Acetal body • Real-time tested • Different types for almost every conventional speargun in the market • weight 155gr Kit includes: • 1 x O-ring for Invert Roller Roller Head G3 • 1 x insulating tab • 2 x O-rings for insulating tab • 3 x loading hooks and fixing inox screws • 2 x Loading assist pulleys made from composite material