Gosen´s patented "Umishima type structure" is developed to further improve sharp hitting feel and high resilience which monofilament profides. "AK PRO 16" which many top players use has thies "Umishima type struchture" adopted. It has been identified that "AK PRO 16" provides performance that exceeds natural gut in terms of less tension loss and excellent resilience.   In addition to this, "AK PRO 16" exceeds natural gut in terms of vibration absorption, tensile strenght, knot tenacity, elasticity and low moisture absorption too.  MADE IN JAPAN   Gauge: 1,31 mm Colour: nature Length: 12,2 m Material/Construction: Original Umishima (Sea / Island) design mono-filament core and outer wrapping with special soft coating Recommended Tension: 50 bis 60 lbs.