Finger Grip

FT-01(H) : Hard - Black

FT-01(M) : Medium - Red

FT-01(S) : Soft - Green
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*Size : 9 x 7.8 x 2.2 CM
*All-in-one hand exerciser specifically design for many musical
  instrument also can be used for finger strength exercise in daily
  life safely and conveniently build strength,endurance,and
  flexibility and coordination,provides a complete strength training
  Extremely portable design,you can use it in easily,strength your
  fingers at any time when you want.