Finger Strengthener,4 Tension Adjustable Hand Grip Exerciser Ergonomic, Ahf-03 Finger Strengthener,OIBTECH 4 Tension Adjustable Hand Grip Exerciser Ergonomic Silicone Trainer for Guitar,Piano,Trigger Finger Training, Arthritis Therapy and Grip, Rock climbing (AHF-03) GUARANTEED:OIBTECH 2 year warranty and friend customer service. All-in-one hand exerciser specifically design for many musical instrument. Also can be used for finger strength exercise in daily life. Safely and conveniently build strength, endurance, and flexibility and coordination, provides a complete strength training solution for fingers, hands, wrists, and forearms Individual finger tension is adjustable, the tension ranges from 4LB to 7LB. You can select different tensions for each finger, providing all-in-one hand fitness. Using silicone material, soft design, comfortable pressing, will not hurt your fingers. Durable, longer using time. Extremely portable design, you can carry it in your luggage, pocket, purse, handbag etc., strength your fingers at any time when you want.