PU Sponge Beginner Training Soft Grip Slow Rebound Finger Strength Ball

PU foam ball + football + frog ball + finger control ball Material: PU foam Specifications: Round ball - approximately 6.5cm in diameter; Football - approximately 8.8cm*5.6cm; Mother frog - approximately 7cm*10cm; Father frog - approximately 10.5cm*9cm; Control ball - approximately 7cm in diameter, excluding the finger grips Hardness: The round ball is soft; the green football is soft; the blue football is medium; the red football is slightly hard; the frog ball is soft; Ball control is a bit soft Weight: Round ball - about 30g, rugby ball - about 23g, frog mom - about 38g, frog dad - about 43g Control ball - approximately 42g Usage: Slightly soft - beginner grip strength training; medium - intermediate grip strength training; slightly hard - advanced grip strength training