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Buy For Fitbit Charge 2 Bands, New Bracelet Strap Replacement Band. I'm attaching photos comparing the black strap that came with my Fitbit and the black .
Amazon.com: MoKo Fitbit Charge 2 Watch Lugs/Connectors/Clasps, Stainless Steel Replaceable Connection Adapter Connect 20mm Watch Band for 2016 .
Amazon.com : Replacement Bands for Fitbit Charge 2, Silicone Charge2 Accessories Band Strap, Pack of 2 : Sports & Outdoors.