Features: Magnetic suction fixing design: Using magnetic suction, without need for needle and thread, quickly and stably fixing the number cloth, convenient and fast. Protect sports wear: Avoid damage caused by traditional fixation methods and keep your sports equipment in good condition. Lightin weight design: 4 pairs weigh only 12.3g, extremely light in weight, without adding any burden, suitable for long-term wear. Magnetic: Quality magnets ensuring that they can be firmly fixed even during intense exercise, ensuring the safety and reliability of your number cloth. Classical black appearance: versatile design, easy to pair with various sports clothes, simple yet stylish. Specifications: Size: Top buckle 22x16.5mm, bottom buckle 16mm Weight: 12.3g (4 pairs) Component: plastic, magnet Package Includes: 4 Pair Race Number Magnetic Buckles note: Other accessories demoed in the pictures is not included. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.