[New Version] Vastar 17pcs Multicolor Replacement Silicon Fastener Ring for Fitbit Flex Wireless Activity Bracelet Sport Wristband - Fix the Clasp Fall Off Problem - (Tracker or Wristband NOT included) 17pcs different full colors to customize you FitBit Flex, giving more love to your Flex! FASTENER ONLY! A must have for Fitbit Flex that used to secure the band in case it loose and drop This simple insurance will keep your Fitbit safe. Light weight and more flexible Perfect fit for your Fitbit Flex activity tracker and comfortable wearing experience This silicone rings For FitBit Flex Wristband Only! Not for For Fitbit One, Force or other models. Only include silicone rings,Not include the band for Fitbit flex.