Package Contents: 10 pieces of running bib clips in 2 colors, including 5 black and 5 white. Sufficient quantity to meet your needs. Premium Material: Made of high-quality plastic and magnetic material, these bib clips are small, stable, reliable, and resistant to breaking or fading. Durable for long-term use. Easy to Use: Separate the magnetic buckle into two halves, place the race number on your clothing, align the halves, and snap them together to securely fasten the bib without damaging the fabric. Quickly attaches and stays in place during activity. Product Size: Front diameter: 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. Note: Light reflection and differences in display screens may cause slight variation in color between the image and the actual item. Measurement error allowed is +/- 1-3cm. Contents: 10 running bib clips (5 pairs) in 2 colors. Other items not included.