You can alternate workouts, with a gradual increase in resistance making each workout progressively more difficult. Made of silicone material with round shaped design.Relieve hand muscle fatigue, people who use computers for a long time in the office, especially for people who are used to the hand. Features -Color:Pink -Material:Silicone -Size:8.00X8.00X2.50cm/3.14X3.14X0.98in -Toughness and elastic to create an integrated molding, to provide resistance to grinding power. -With the smooth surface and different strength type, can strengthen hand feeling, anti-slip massage. -Designed in round shape, and palm convenient storage, home travel can be played. -Simply wash the stain and make it look new. Suitable for your hand strength training in home and fitness center. -In adoption of silicone material, this hand finger strengthener wear resistant for long serving time. Package list: 1 x Hand Strengthener