Package Contents: 10 pieces of running bib clips in 2 colors, including black and white, 5 pieces of each color. Sufficient quantity to meet your needs. Premium Material: Made of high-quality plastic and magnetic material, these bib clips are small, stable, reliable, and not easily broken or faded. Designed for durability and long-term use. Easy to Use: Separate the magnetic buckle into two halves, align the number plate at the desired position on your clothing, then connect the two halves together. This securely fastens the race number without damaging the fabric. Product Size: Front diameter measures approximately 17.5mm (0.69in), back diameter 16mm (0.63in), magnet diameter 10mm (0.39in). Wide Applications: Ideal for running, skiing, track and field, cycling, rock climbing, mountaineering, marathons, and other sports events requiring race number attachment. Color: Black & White Material: Plastic + Magnet Note: This product is not suitable for children under 13 years old. Light reflection and display differences may cause slight variation in color between the image and the actual item. Measurement error allowed is +/- 1-3cm. Package includes only the items listed above; other accessories are not included.