FOUR DIFFERENT SIZESThis football basketball training aid have 4 different sizes can be chosen - 30LB, 40LB, 50LB, can suitable for different stages of training, Gradually increase your hand grip. LIGHTWEIGHT AND DURABLE DESIGN3.15 x 3.15 x 0.87 inch, 0.16LB. You can training your hand grip anywhere - at home, school, training ground or travelling, during your hands are free. Made of top-quality Silicone, not easy to tear. It is washble and can be used frequently and comfortably. FOOTBALL BASKETBALL ACCESSORIESGrip training is an item in the daily training of football and basketball players. Strong grip can improving football / basketball dribbling, catching and shooting. If you are a football / basketball player, our grip Trainer is your MUST HAVE training equipment. FITNESS & SPORT ENTHUSIASTSStrengthen your wrists, improve the dexterity of your fingers and increase the your hand grip while reducing fatigue. REHABILITATION & PREVENTIONGreat for rheumatoid arthritis, arthritis, carpal tunnel, tendonitis, tennis elbow and help recover from a fractured or broken wrist.