2 Pcs Replacement Wrist Band With Clasps + Charging Cable for Fitbit Flex Bracelet Smart Wristband (Slate+Black) 100% Brand new and high quality. Replacement Band for Fitbit Flex. Wristband Material: TPU, Chargers Material: Plastic. The size can be adjusted according to the circumstance of individual wrist. The charger is used for Fitbit Flex Only, not work for fitbit One or other.