Lamiess Lms 351 Round Badge Reel, Pink, Pack of 50

Badge reels are generally used to fasten ID badges or name tags onto clothing.

The working mechanism of a badge reel is similar to that of a clothespin.

The clip opens when pressure is applied; the collar or pocket of the garment is placed into the opened part, and the pressed end is then released.

Held in place this way without damaging the garment, the badge reel is also far less likely to fall off or get lost. 

They come in varieties such as steel-cord badge reels, lanyard-mounted badge reels, and belt-clip badge reels.