This premium kit was developed by 2017 RS Aero World Champion and the 'Boat Whisper' himself Steve Cockerill of Rooster Sailing, and contains all the components you need convert your RS Aero to over deck control lines. You will require a needle fid and whipping twine to install this straight forward kit. The kit contains: Downhaul control line. Outhaul control line. Downhaul bungee. 3x 30mm blocks. Traveller line (with pre-spliced loop). 2x Side deck strops. 2x Ronstan shock blocks (Blue). 2x Ronstan shock blocks (Red).