31 STRAND INNER CABLE IS SOFTER , SMOOTHER AND MORE SUITABLE FOR INTERNAL CABLE SYSTEM THAN 19 STRAND STRONGER STRUCTURE THAN 19 STRAND , INCREASES 10% TENSILE STRENGTH , MORE STABLE , MORE SURABLE AND LONGER LIFE LOWER FRICTION , SMOOTHLY WORK THROUGH BICYCLE FRAME AND BRINGS PERFECT CONTROL PERFORMANCE ULTRA SMOOTH AND 3 TIMES LONGER LIFE AFTER SPECIAL HIGH TECH TREATMENT SUPERIOR SHINE