R-N-R"s Trident Series 5/16" H2O Lines feature a bright yellow polypropylene sheath for high visibility, blue tracer stripes and nylon core for strength. The 3/8" Trident Series H2O Lines feature a bright yellow polypropylene sheath for high visibility, red tracer stripes and nylon DryCore for strength and minimum moisture absorption. The 3/8" is also certified to the NFPA Throwline standard. The supple nature of these high floatation ropes make for easy stuffing and quicker deployment during rescues. Ideal for use in throw bags and as swimmer tether lines. Trident Series 7/16" H2O Lines feature a double-braided high tenacity polypropylene construction for high strength, great handling and maximum floatation. The sheath is bright yellow polypropylene and it"s tracer stripes are red. The 7/16" H2O Line provides better abrasion resistance and a larger diameter for a better grip with a gloved hand and is the Ideal choice for ice rescue due to its higher strength and supple hand.