Set of 2 hand trainers silicone grip balls for strengthening fingers and forearms, relieving stress Color, style and size: red, 30-40LB, about 8 cm in height diameter, about 2.2cm thick (due to manual measurement, please allow a little error) SAFE AND DURABLE MATERIALMade of high quality thermoplastic rubber and food grade silicone , no strong smell of rubber, can be cleaned, longer service life, not easy to tear. Stress reduction and hand exerciseStrengthen and improve flexibility of fingers, wrist and forearm, recover from injury or increase finger strength. It keeps you focused and relieves stress. Can also be used as a decompression toy for children. Easy to carry: they are lightweight and portable, so you can train your hands and forearms at home, in the office, on your feet or in your car, and they are easy to use and ready to exercise anytime, anywhere. SUITABLE FOR EVERYONEThe strength trainer is ergonomic and suitable for everyone hand types and all ages, great for men, women, seniors and teens. Helps improve grip strength in sports like baseball, tennis, soccer golf; increases finger strength for hobbies like rock climbing or music; suitable for men, women, teens, adults and seniors EASY TO USE: Squeeze, hold, release and repeat with palm, thumb and all fingers; insert one finger into each hand and gently pull outward; easy to clean, keep it in your bag or pocket and take it with you everywhere Recommendation: 10/20LB, for children 20/30LB, for elementary school or middle school students; 30/40LB, for womens daily exercise; 40/50LB, for mens daily exercise; 50/60LB, male fitness enthusiasts; 70/80LB, for large hands or professional athletes.