Being 100% polyester ropes, they are very low-stretch and very durable. When hauling on a big wall, it can be nice to have low stretch so you don't lose energy when you pull that rope through your micro/pro traxion. Some choose to have a spare dynamic available by hauling with another dynamic rope but that is just a more bouncy ride for the pig. 9mm is lighter and skinnier than 9.5mm (3/8"), but 9.5mm is going to last longer. Don't fall on these ropes. IF they held and didn't snap, you would turn into mashed potatoes. 9 mm: High strength and low elongation in lightweight package. A versatile static rope with super low-elongation. Great for SAR teams or for tower crews for use in lightweight hauling and anchors. 3/8" (9.5mm): 3/8" polyester static rope for arbor climbing rope access and lifting. Made in the USA. Good for search and rescue taglines, mountain rescue, and lightweight tensioned systems. 7/16" (11mm): Maximum strength with low stretch. A multi-use rescue and rappel rope perfect for rope rescue, rope access and efficient ascending/descending. Low-stretch properties and high-moisture resistance allow the 7/16" to operate consistently in wet and dry conditions. NFPA 2500 (1983) We sell this rope BY THE FOOT. Please input number of feet desired in quantity. If you want multiple lengths cut, leave an order note. Diameter 9 mm 3/8" 7/16" Dry Treatment No Static Elongation 9 mm: 1.6% at 300 lbs 3/8": 1.8% at 300 lbs 7/16": 1.9% at 300 lbs Static Elongation at 10% of MBS 9 mm: 2% 3/8": 3% 7/16": 3.4% Center Mark No Sheath Construction Polyester Core Construction Polyester MBS Rating 9 mm: 20 kN 3/8": 26.6 kN 7/16": 30.5 kN Rope Weight 9 mm: 66.3 g/m (4.3 lb / 100'), 3/8": 85.5 g/m (5.3 lb / 100'), 7/16": 98.1 g/m (6.5 lb / 100'),
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