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Climbing ropes are an important piece of your climbing equipment as they are your lifeline. With a huge selection available on the market, it can be confusing to know what to buy.Half or double ropes are used in a pair, but clipped individually when climbing on trad routes and are usually 8-9mm thick. Twin ropes are also used as a pairbut are treated as one when climbing traditionally, clipping in the same pro on the route.