Smart Watch Band Compatible with Polar POLAR M430 / M400 Smartwatch Strap with Removal Tool Adjustable Sport Band Replacement Wristband 2023 - US $15.59
Amazon.com: RuenTech Bands for Polar M400 / M430 Watch Strap Replacement Soft Silicone Wristband Sports Band For Polar M400 and M430 GPS Smart Sports Watch-Black L(5.5''-9.0'') : Electronics
Soft Silicone Wristband Strap For Polar M430 M400 Smart Watch Band Replacement Watchband For Polar M400/M430 - AliExpress