KOSOX 1pc Replacement Wrist Band Clasp Fitbit Flex Only For Fitbit Flex and No Tracker Replacement Rubber Bands with Clasps Only for Lost or Damaged Bands Good Quality. Easy for Replacement Size: approx. Small ( fits for 5.5" - 6.7" wrist) / Large ( fits for 6.4" - 7.20" wrist) Rich Choices Color Your Life