The Rubber These bands are made with only the best: Primeline Bulk Rubber. Natural Latex Rubber Tubing made by PRIMELINE'S "Continuous Dip Process" creates a superior natural latex rubber tubing. The physical properties are better, the quality higher and the colors more vibrant than product manufactured from dry natural or synthetic materials. The Wishbone A chain is only as strong as its weakest link, so why make that the wishbone? These polespear bands use Triple Jacket Spectra: the strongest line on the market. Period. Features: 100% Spectra construction Extremely strong with negligible stretch - 10 times stronger than steel by weight Almost Neutral Buoyancy with a specific gravity of .97 Hydrophobic and therefore non-wetting unlike nylon/Dacron braided lines Extremely High UV resistance eliminating the problem of sunlight degradation 100% strength retention after 2 years immersion in salt water One of the most abrasion resistant materials available with good cut resistance Each line is top-coated with polyurethane specifically formulated for the specific lines application Diameter: 2.2 mm Rated Breaking Strength: 1540 # (700 kg) Triple Braid Construction for extra safety; three braided layers resulting in two fall back layers after the outer jacket fails before the wishbone breaks: 1540# - 939 # - 300 # Extremely dense ultra-fine outer-braid for maximum abrasion resistance UV Stabilized Polyurethane topcoat formulated to seal the line from dirt and enhance abrasion resistance without unduly stiffening the line