Slings, Extenders and Daisy Chains for climbing are all made of Nylon (polyamide) or Dyneema®/Spectra® (polyethylene) webbing.
Dyneema® is much stronger than nylon and polyester but less elastic. According to DMM, even a 60cm fall-factor 1 fall on to an open Dyneema® sling can generate enough impact force (16.7 kN) at the anchor to pull a Wallnut 11 wire (12 kN) apart. In fact nylon/polyester slings can also snap wires and both substances lose significant strength with wear, whilst pulling an abseil rope through a sling of either material can generate sufficient heat to weaken it or melt it completely.
It follows from this that slings and extenders should be replaced regularly (say every three years with normal use, but sooner if they look badly worn), that if you use slings in a belay system, that system should have no slack in it whatsoever, and that slings should never ever be used as a cheap via feratta clipping system. All slings should be inspected regularly and replaced if they show signs of excessive wear or damage.
There is a good article on slings on the DMM Website.
Slings are measured by length, not circumference:
Nylon slings rated at over 2 Tonnes (22kN). Ideal for situations where hard wear is expected.
Extremely light slings with a tubular and variable weave construction.
Thin 8mm wide Dynatec slings that are just as strong (but not as hard wearing) as wider climbing slings. They are ideal for narrow thread protection and to slot behind flakes where there is little
Narrow dyneema slings in 11mm Dynatec tape. Much lighter than standard nylon slings. Three lengths.
Cordelette sling is designed for use in equalising several belays to a central point.
A single strand "Snake" sling for threads in particular. 110cm long and very light (35g)
A snake sling available in four colour coded lengths.
Narrow Dyneema slings in 10mm tape from Beal. Three lengths.
A sling made with a core of twisted Dyneema yarn surrounded by a tough abrasion-proof sheath.
Combines the low weight and high strength of Dyneema with the abrasion resistance of polyamide.
Unusual sewn slings made of 6mm Aramid cord. Excellent for thread placements.
An 8.3mm dynamic rope sling for clipping in, equalising a belay or extending an anchor point.
Rope lanyard designed to clip into a belay and set up a top rope/lower off at the end of a single pitch sport route.
Sewn dynamic rope lanyard/sling designed to shortlink into a belay point, particularly on sport routes.
The Beal Jammy is a sewn Prusik Loop made from 5.5mm cord - three lengths.
Closed sling Express type extenders with extra stitching and a rubber insert. Three lengths.
Open sling 30cm extenders that make a floppy quickdraw that is less likely to lift the gear out.
Amazing ultralight full strength (22kN) Dyneema 30cm extender roughly 8mm wide. B
Probably the best climbing wall and sport route extenders. Available in three lengths.
Very light Dyneema stitched express extender. 10cm and 17cm.
The standard Screamer can effectively reduce peak loads by 3-4kN.
The Shorty screamer offers the same properties as the standard Screamer but is more compact.
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