For Fitbit Versa 4/3/2/1 Sense 2 Silicone Strap Wristband Replacement Watch Band
X1 FitbitVersa 4/ 3/Sense 2 1 Strap (Watch not Included). (A tough strong silicone with the details). Small = 5.5" - 6.7" (140mm - 170mm). SMALL or LARGE size (select above).