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Oura Ring 4 Ceramic is a premium smart ring made from scratch-resistant zirconia ceramic. It discreetly measures over 30 biometrics including sleep, heart health, and stress levels, providing personalised insights 24/7. With Smart Sensing technology, it adapts to your finger for highly accurate, continuous data. Track over 50 health and wellness metrics, and get personalised insights into sleep, activity, stress, metabolic, heart health, and women's health. AI-powered Oura Advisor offers actionable insights that become increasingly tailored over time.