Strike Silicone Sports Straps For Smartwatch HK9 Pro WS-L99 WS 39 Ultra DT 900 S8 Ultra HK 9 Ultra CT9 Ultra i8 Pro Max S9 Ultra Y8 Ultra HW9 Pro Max HW9 Ultra Max Z55 Ultra Z70 Ultra CT9 Ultra T900 Ultra N8 Ultra Z66 Ultra (42mm-44mm-45mm-49mm)