Replacement control line or Hobie Mirage kayak rudder systems. 

• Super strong braided spectra cord, 700lb
• Sold per metre
• LINE-CONTROL 700 LB GRAY, Part# 81023001

Also see:

• Hobie Kayak Rudder Line Replacement Kit
• Hobie Island Rudder Line Replacement Kit
• Island rudder control line (beige, 1000lb, per metre)