[Magnetic Material] The running bib clips are made of very great quality material. It can be firmly adsorbed on the clothes and firmly fix the number cloth, which is not easy to fall off. The magnetic buckle has a sturdy magnetic force, each magnetic buckle has a diameter of about 16-17.5mm, the internal magnet has a diameter of about 10mm, and the material is light and portable. The internal magnet uses high-strength magnetic force and has sturdy adsorption. [Practical Accessories] Race bib clips are very practical and convenient accessories. There are 12 products in total, in black, white and Red, suitable for various event clothing, and it is a practical running tool and . Traditional pins can easily damage clothing and pierce the skin. Using magnetic clips instead of traditional pins could protect clothing and skin, and it is also very stable. [Easy to Use] Our number bib clips for runners are very easy to use. First, separate a pair of magnetic buckles into two separate parts. Next, take your number cloth (runner bib) and determine the corner or edge you want to fasten. Place one magnetic buckle on the front of the number cloth, positioning it near the edge, and then place the other piece on the back to align so that they snap together securely. [Wide Applications] The use of race bib magnets has a sturdy magnetic force, and it not fall off easily even if you participate in intense sports events. It can be used in track and field events, as well as triathlons, cycling, climbing and other sports. Secondly, magnetic buckles can also be used in marathon competitions, school sports games and other occasions. The application scenarios of race bib magnets are very wide. Colour:A:Black & White & Red Material:magnet Package Contents: 12 * Marathon Number Buckle 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.