You can buy a special Oura Ring 4 bundle at this store
However, Oura recommends wearing one of the plastic rings in the sizing kit for 24 hours ... and Rose Gold model is available ...
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Circular Ring 2 unveiled at CES – and it's the end of plastic sizing kits for smart rings
rather than a plastic kit. The new ring, which is available in Gold, Silver, Rose Gold and Black, is crafted from titanium and packs an improved ECG sensor powering the FDA-cleared AFib detection ...