The GRIPMASTER is our signature model. It"s ideal for any musician wanting to develop hand strength. Available in three different color-coded models of graduated resistance. Extra Light 3lb per finger - Recommended for new instrumentalists and those preferring more repetitions with less resistance. Light 5lb per finger - Recommended for most adults. Medium 7lb per finger - Recommended for serious musicians whoâ€TMve graduated from using “Light†Gripmaster and are ready to take their performance to a new level.