Each sold separately. 

Introducing NTR, a line of spearfishing accessories designed to eliminate the knuckle busting hassle of assembly tools.

The NTR Insert is designed to allow installation and replacement of the wishbone cord after the insert is installed in the band. This is helpful if you have a closed muzzle gun or if you wear out your wishbone cord before the rubber. To install them simply lube them, push them into the band using your thumb, tie your constrictor knots and you're ready to hunt.

NTR Inserts are compatible with 1.9mm and 2.5mm wishbone cord. (They can also be drilled to accept the 3mm cord but that would involve a tool thus the parentheses and tiny print)