Blue Resistance: Medium Strong (7.5 lbs (3.6 kg); Size: M (Diameter 1.8 inches (4.5 cm)); Weight: 2.5 oz (70 g); Material: Non-latex polymer; Exercise manual included *Resistance means resistance when crushed in half
Pinching it with your fingertips or holding it all over your palm. Increase finger dexterity and grip strength and increase blood circulation
The special material has excellent resistance and resilience for a comfortable texture, and can also be used for hot and cold therapy
Size: M (diameter 1.8 inches (4.5 cm), XL (diameter 2.0 inches (5 cm) x length 2.4 inches (6 cm) round size); 4 colors of resistance according to the level (XL comes in 3 colors except yellow)