Super Shockcord / Bungee with Corkscrew Swivel for Speargun Line 1.9mm diameter 550 lb tensile strength braided Spectra core line 450lb Stainless Steel Corkscrew Snap with precision ball bearing swivel Big-Fish-Duty 1/2" OD Latex Shockcord Tubing 6 Inches of Shock Absorbing Stretch