Made of polypropylene, sturdy but flexible material. <br /> Smooth surface which can't scrape the skin. Secretly transform any bra straps to racer back straps easily. <br /> Prevent bra strap from slipping, which solves the problem of constantly bra straps falling. <br /> Package included: 8 pcs of clips in 4 Shapes(Round, Oval,"H" and "8"). <br /> Note:<br /> 1.Please allow a little size error due to manual measurement.<br /> 2.Please be aware that due to lighting effects and monitor's brightness/contrast settings etc, the color tone of the website's photo and the actual item could be slightly different.<br />