5mm accessory cord, sold by the meter off a reel.
5mm or 6mm cord is the usual choice for prusik loops. 5mm is best on thinner ropes and 6mm is better on thicker ropes. For a pair of prusiks you will want to buy 4m, and then cut down as necessary as 3m can just be a little on the short size.
Breaking Load 580 daN (kg)
Conforms to the requirements of the UIAA and EN564.
Colour may vary.
Price per Meter – See more at: http://www.rockrun.com/brands/beal/beal-accessory-cord-5mm#sthash.9O2slh8H.dpuf
Weight No Manufacturer Beal Type Cord Diameter (mm) 5 Breaking Load 580 daN (kg)