The JJM Wrist Training Ball Gyro Ball is designed to enhance your arm strength and promote muscle recovery. Made from durable PC plastic, this gyro ball features an automatic start design that makes it easy to use. Simply push the core in the direction of the arrow, and the internal spring will start the rotation effortlessly. The cool colored LED lights inside add a fun element while you work out, making it an enjoyable way to pass the time and alleviate muscle soreness.One of the standout features of this gyro ball is its smooth rotation without any strange vibrations, ensuring a long-lasting performance during use. Its compact and convenient design allows you to carry it anywhere – whether you're at the office, gym, or home. It serves as both a stress-relief toy and an effective exercise tool for your arm muscles.Regular use of the JJM Wrist Training Ball can promote blood circulation and increase the strength of your fingers, wrists, hands, forearms, biceps, triceps, ligaments, and shoulders. It's an excellent addition to your fitness routine if you're looking to restore muscle strength and improve overall arm fitness.This unisex-adult wrist training ball has received mixed customer reviews with an average rating of 3.1 stars based on 46 ratings. It ranks #376,427 in Sports & Outdoors and #79 in Strength Training Wrist & Forearm Strengtheners on Amazon. Available since October 23, 2023, it has quickly become a popular choice for those seeking a versatile and portable hand strength training tool.