"Summary of characteristics 1-With the number buckle, you attach your number bib quickly, easily and accurately on your shirt or jacket. 2-Your running gear will no longer be damaged by pinholes and there's no need to fumble around with safety pins. 3-These race number buckles can be used for many sports, such as skiing, skating, athletics, running, dancing, when you need to place the race number 4-Easy on, easy off, and can be reusable."