Ltpgtthe compact sized 66fit adjustable hand grip exerciser allows you to adjust tension from 5kg to 20kg or 10 to 40kgltpgtltpgtltstronggtfeaturesltstronggtltpgtltulgtltligtmaterial plasticltligtltligtcolour whiteorange 5kg 20kgltligtltligtcolour blacksilver 10kg 40kgltligtltulgtltpgtltstronggtdescriptionltstronggtltpgtltpgtby simply twisting the white knob you can increase or decrease the tension