Available in four color-coded models of graduated resistance.
YELLOW/ X-Light Tension - 3 lbs. per finger for light resistance *
BLUE/ Light Tension - 5 lbs. per finger for average hands
RED/ Medium Tension - 7 lbs. per finger for above average hands
BLACK/ Heavy Tension - 9 lbs. per finger for strong hands
Note: Many repetitions rather than heavy resistance is highly recommended for best results.