Usage Tips:Package Contents: You get 10 pieces of running bib clips in 2 colors, including black and white, 5 pieces of each color. Sufficient quantity meet your needs. Premium Material: Our bib fixing clips are made of great quality plastic and magnetic material, small, , 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 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, , 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: 10pairs * running bib clips in 2 colors Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.