Flying snake is a carbon kevlar reinforced casing with a carbon inner wire highly compressed it is 30 lighter than standard wires shimano and campagnolo compatible fits both mtb and road bikes 100 rustproof ultra lightweight 30 enhanced durability easy to set up no maintenance required quick precise direct transmission watertight internal jacket anti uv protection pp coating main jacket includes 18 carbon steel wires pack contains 2 stainless steel inner wires