Tkasing Replacement Bands with Metal Clasps for Fitbit Flex/Wireless Activity Bracelet Sport Wristband Small/Large (No Tracker, Replacement Bands Only) Large Size: 6.3-8.3 Inches; Small Size: 5.4-6.9 Inches.Free size fit your wrist depend on button site you place. Silicone fastener rings for free to keep your Fitbit Flex to protect the clasp loose and band fall off. Comfortable for sporting time. Multiple different colors and styles for you to choose, match your daily style. Look good no matter what you are wearing. Note:No Fitbit Flex Tracker or other parts! For Fitbit Flex Band only! Please kindly contact us if there's any technical problems or quality issues of the fitbit flex Band.