The power web flex grip is a unique exerciser that can fit in the palm of your hand and provides the ability to work on dexterity extension and strengthening in your hands fingers and thumbs. the power-web flex-grip has finger and thumb holes and two sides. one side features a ball to squeeze while the other features buttons and a thumb pad that exercises the fingers individually in order to increase dexterity and strength in your fingers and thumb.available in three different resistances to meet the needs of a variety of patients at a range of different skill levels • resistance level 1 - light (yellow):- for children geriatrics beginning strength programs arthritics carpel tunnel• resistance level 2 - medium (red):- most popular for all around use strengthening flexibility injury rehabilitation sports fitness• resistance level 3 - heavy (green):- for more advanced rehabilitation strengthening sports fitness injury prevention