JBL's unique latex formulation and dip manufacturing process delivers radical modulus strength. The power curve increases as bands are stretched for optimum performance. Special anti-oxidants help protect against harmful U.V. rays, prolonging sling life. The Sling for JBL D36 Pole Spears has a Non-Corrosive Plastic Threaded Screw Retainer to Fasten Sling to Pole. Sling measures 3/8" x 20" (9.5mm x 508mm). Sling makes a great Save-A-Dive Kit Item and is covered by a 12 month limited warranty.