GripPro trainer is an extremely effective finger-hand-forearm strength and endurance trainer. It comes in 3 different levels of difficulty: Green-30lb max resistance (easier)-for lighter weight people and warming up, Black-40lb max resistance (medium) for average weight men to train with and Red 50lb max resistance (difficult) for big guys or lower rep strength training. Package Includes: Green - 30 lbs Black - 40 lbs Red - 50 lbs.