Free size that adjust by the button site.Choose different color to change mood in daily life. Beautiful color for your choice and can get variety color then change every day and fit your clothes. Nice replacement accessories for Fitbit Flex wristband. Type:Generic / Unbranded. Size: Small size (4.7-6.8 Inches)(4.7-6.9″/120-175 mm) NOTE:No Tracker or other parts! For Fitibit Band only! Replacement Rubber Bands with Metal Clasps Only.