Eway Hollow with Metal Clasps for Fitbit Flex / Wireless Activity Bracelet Sport Wristband / Fitbit Flex Bracelet Sport Arm Band (No tracker, Replacement Bands Only) The Fitbit accessory band is specifically designed for the Fitbit Flex. No Tracker or other parts! For Fitbit Flex Band only! The Fitbit Flex Color Bands feature a top window cutout that reveals the device LED lights. The Fitbit accessory is a one size fits most wrists, Designed to fit most wrists (Band Length: 225mm / 8.86"). This latest brand new replacement band fits your wirst perfectly which make you more comfortable to wear.