Product size about : 15.9*11.5cm/6.2*4.5'' Product color: As shown in the figure Product material:High carbon steel + nylon product features: 1. This smart grip strengthener features an LED display that shows real-time data like rep count, time, and calories burned, making it easy to track your workout progress. 2. With an adjustable resistance knob, you can change the pressure from 5kg to 100kg to match your fitness level, whether you are a beginner or advanced user. 3. The ergonomic handle is designed for a comfortable and non-slip grip, allowing your fingers to rest naturally and helping you exercise safely without strain. 4. Built with a strong steel spring and eco-friendly materials, this grip trainer is long-term use and supports effective strength building. 5. It offers multiple smart modes including timer, counter, and calorie tracker, along with a rechargeable battery and night-friendly screen for convenient workouts anytime. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Shipment includes: 1 pc Hand Grip Strengthener