Marlow Excel Fusion 6mm 13.5m in length. A premium mainsheet made with a 12 strand SK78 Dyneema core with a 16 plait blended Dyneema/polypropylene cover. Minimal elongation due to the Dyneema, and very light weight in comparison to other mainsheets. Zero water absorption means that it stays light. This is a grippy mainsheet but easy on the hands. Note - as with some other mainsheets it is advisable to wash with mild detergent before use.  Price is per metre.