Planet Waves GMXL Grip Master

GMXL Grip Master description:

• Gripmaster is uniquely effective because each finger is isolated and flexed on an individual spring-loaded button.
• Gripmaster delivers total conditioning for each individual finger, the entire hand, wrist, and forearm.
• Beginners will leap months ahead in fingering strength and ability.
• Professionals can easily warm up before performances.
• Pocket-size and durable. Work out anytime, anywhere - even when your instrument is not available.