This is the heavy duty 600Ib lines for kitesurfing from North all 4 lines are the same length, so will fit most 4 line bars be it best naish etc. Modern bars, have different length front and back lines, so these will not fit. There are two Grey/white lines and two red/white colored lines They have stitched in heavy duty loops in the ends of the lines, colour coded to the lines, the lines are a little waxed to help stop the lines tangling. These lines are perfect if you want to make up your own lines, unpick the stiching and slide the sleeving to the desired lenth and then re stich.