Package Contents: You will get 100 pieces of running bib clips in 2 colors, including black and white, 50 pieces of each color. Sufficient quantity will meet your needs. Premium Material: Our bib fixing clips are made of great quality plastic and magnetic material, small, lightweight, stable, reliable and not easy to break or fade. You can use with confidence. Easy to Use: First, take out our magnetic buckle, and split the magnetic buckle into two halves, then take out the number plate and align it with the fixed position, finally connect the two halves of the magnetic buckle together, which can quickly fix the number on your clothes and will not fall off easily. Product Size: The front diameter of running bib clip measures about 17.5mm/0.69in, the back diameter is about 16mm/0.63in, and the magnet diameter is about 10mm/0.39in. Please note that this product is not suitable for children aged 13 and under. Wide Applications: Our running bib clips are ideal for running, skiing, track and field, cycling, rock climbing, mountaineering, gymnastics, marathons, and other sports that require competition numbers. Product Size:front diameter: 17.5mm/0.69in, back diameter: 16mm/0.63in, magnet diameter: 10mm/0.39in Colour:Black & White Material:plastic+magnet Package Contents: 100pairs x running bib clips in 2 colors