This 7mm Pigtail Bungee helps maintain optimal tension in your spear line.

This device has a range of benefits to your speargun set up that makes it a necessary component of your speargun. One of the most important features is that it maintains optimal tension in your spear line. 

It also serves as a safety net for other rigging features once you've speared a fish. If it begins to run, the tension it can place on your rigging can cause damage if the impact is too sudden. With bungee cord, this is avoided as the impact pressure is slowly added to the gun due to its elasticity.