Round and spiky,does the job.
Minky 30m Retractable Reel Outdoor Double Washing Clothes Line 2x15m FREE P&P
Ive only extend mine about 5 metres,bit saggy,so put up high as you can. Other than that does a good job
The Sting- Special Edition (DVD)(Region 2,4,5 PAL)(2005)- Robert Redford