i-smile 3pcs Silicon Fastener Ring for Fitbit Flex Wristband - Fix the Clasp Fall Off Problem - (Note:Tracker or Wristband NOT included) (Pink) Designed specially for fitbit flex to protect the clasp loose and band fall off This simple insurance will keep your Fitbit safe. Light weight and more flexible Slide the ring over the clasp when you put on your wristband, simple as that The size of the silicone rings have been specially designed to fit the Fitbit Flex. It does NOT fit other activity trackers or wristbands Note:Tracker or Wristband NOT included. Only 3pcs Silicon Fastener Ring for Fitbit Flex