Reliable Material Selection: these running bib holders are made of quality ABS plastic materials, which are stable and durable to use, lightweight and portable, won't bring extra burden and affect your athletic performance. Without Punching Holes: you can take advantage of these race bib clips to securely fasten the numbers to your shirt or jacket in an easy way, no need to worry about these fasteners will do harm to your clothes, bringing a lot of convenience to you. Practical and Convenient to Apply: adopting a button design, this race bib holder can help you quickly and accurately fix the bib on the sportswear, easy to wear and take off, not easy to fall off, and can be applied many times. Applicable for Many Sports: when you need to place a race number, these race number clips can help you a lot, suitable for skiing, skating, track and field, cycling, climbing, running, dancing and so forth. Compact and Safe: each marathon bib clip measures approx. 1.7 cm/0.67 in diameter, small dimension and light in weight, easy to store and carry, won't take up much spaces; Besides, they don't have pointed edges, reliable and safe to use. Color:Mixed Color Material:plastic Package Contents: 40 * 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.