Magnet inside, outside with smooth plactic shell, (bobby pins & pins not including). Can store sewing needles, sewing pins, hair clips, hair pins, paper clips, bobby pins, screw cap, tack, hardware etc. Strong magnetic holders keep them lined up and ready to grab and prevent loss. Have round & oval two kinds. It’s an ideal finishing tool, it is not like the traditional cloth needle cushions, do not need to insert a needle into the needle cushions, will save your time.