Function:Perfect exercise gadget for sports like golf， tennis， squash， cricketm badminton， baseball， bowling， basketball， motocross， mountain climbing.Increases strength in fingers， wrists， hands， forearms， biceps， triceps， ligament and shoulders.Great benefit for musicians， guitarists， pianists， drummers.The package includes:1x Forceball with LED speed meter1x starter rope1x hand strap1x User Manual