The Core Sensor Pro bar is a four line bar that is a great upgrade from your standard bar. This bar comes with non stretch vario lines. That means you can adjust the line length to be 18m, 20m, 22m, or 24m. The lines are made out of tectanium. Which has been patented by core and is up to 4 times more stretch resistant as well as having a 50% higher breaking load and they are 10 % thinner! In addition the bar is also lighter than any bar on the market weighing only 210g! It gives you more direct feedback when steering the kite.