In reply to jack_44: Hi Jack
I Wud agree with the other posters that 8mm dyneema is the best as they take up the least space when racked on your harness.
I currently use 10mm dyneema for my 60cm sling draws which are a few years old but still have life in them yet and not to bulky on harness.
16mm nylon will be to wide imho and make raking a pain.
Needlesports have some good offers for krabs and slings which will not break the bank.
I have a 120cm 8mm dyneema sling I use all the time and its been on my harness for the last 4 years and still going strong, so I would not worry re ware for thin dyneema slings.
HTH Davey