GOSEN "UMISHIMA" is a unique technology that blends multiple materials in a monofilament for diverse string characteristics. It's named after islands on the sea, signifying the merging of different elements. The number of "islands" on the "sea" creates different characteristics. The AK Series was initially created in collaboration with and utilized by the professional tennis player Anna Kournikova.
 
This monofilament string features a distinct UMISHIMA structured side thread, delivering a stiff and responsive feel that is ideal for competitive athletes.
 
Material: Original UMISHIMA structured nylon wraps
Gauge: 1.29㎜ (16GA.)
Length: 12.2m (40FT.)
Made in Japan
 
Structure and Advantage of UMISHIMA Series