Nylon, Spandex Imported Hook and Eye closure BACKLESS KIT TO CONCEAL for your racer back dresses,tank tops,sleeveless backless shirts,halters,wedding and prom dress. No show underneath any your low back racer back fashions,and no cut into skins. PERFECTLY CONVERT ANY BACK FASTENING BRA FOR LOW BACK TOP RACER BACK DRESS.Save money and time! No need to buy a new bra when you can convert one of your own favorite bras into a low back bra. MAKE YOUR BRA INVISIBLE AND STAY COMFORTABLE. Our strap is super soft and clear,stretch and strong to hold.It lowers the bra band in back by an average of 4 inches. HOW TO WEAR As you put your bra on, you will have strap hook end to bra eye,and strap eye end to bra hook,Cross the straps behind you and bring them around your waist,or as low as you like,to the front. At this point hook the straps together with the hook and eye closure at the front. SIZE: 11.5*7.5*3CM