Invert Roller or standard Roller or even with both systems simultaneously doubling the overall force ! 
 
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
Reinforced low profile arches
Self Lubricating inserts
improved lateral agility on spear-gun (due to low profile)
full pretension capable (100% pretension with no arch deformation)
High endurance, low friction Industrial  Acetal body
Fits rubber dia 12-16 mm
Fits line dia 2-4 mm
Inox Anchor point underneath for line attachment/guide
Real-time tested
Different types for almost every conventional speargun in the market
weight 86gr
 
MVD1021C
 
Please make sure you use a spear shaft with shark pins/fins for your roller setup