EverAct Trade; Silicon Fasteners for Fitbit Alta/Flex/Garmin,Color Your Life Designed specially for fitbit Alta/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 Alta/Flex. It does NOT fit other activity trackers or wristbands Note:Tracker or Wristband NOT included. Only 4 PCS Silicon Fastener Ring for Fitbit Alta/Flex(Black Color)