Features: Auto-Start Functionality: The auto-start wrist trainer ball activates effortlessly, allowing you to focus on building wrist and forearm strength without any manual setup, enhancing your workout experience. Versatile Gyro Ball Design: This gyro ball wrist strengthener offers a multi-faceted exercise platform, targeting not only your wrists but also arms, fingers, and shoulders for comprehensive strength training. LED Hand Grip Feature: Equipped with a vibrant led light, the hand grip wrist ball adds a fun element to your workouts while providing visual feedback on your performance and progress during exercises. Durable Construction: Crafted with high-quality materials, this gyroscopic forearm exerciser is designed for long-lasting use, ensuring you can strengthen your muscles and bones effectively over time. Strengthen Key Muscle Groups: Ideal for enhancing biceps, triceps, and ligaments, this versatile exerciser promotes stronger bones and muscles, making it perfect for athletes and fitness enthusiasts alike. Specification: Diameter: 7cm Material: PC, Silicone Notes: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Include: 1*Auto-Start Wrist Trainer Ball 1*String