A & A Silicone Fastener Rings for the Fitbit Flex Wireless Activity Wristband (12 pack) Your Fitbit Flex band Will Always Be Secure: You will never have to worry about your activity band falling off with these unique secure fasteners for your wireless wristband. Includes fasteners only. 10 Colors (12 pcs in a pack): 1 pack includes fasteners in black (3 pcs), white, green, yellow, orange, blue, light blue, red, pink and purple ONLY FITS FITBIT FLEX : The size of the silicone rings have been specially designed to fit the Fitbit Flex. It does NOT fit other activity trackers or wristbands. Does not fit the Charge. Easy to Use And It Works: Slip the ring over your clasp and the band will be safe and secure.