Oura Ring is crafted with titanium and has a seamless inner molding (for comfort). Due to the plastic used to make the ring sizers, they may seem less comfortable than the actual Oura Ring. Without proper ring orientation, Oura won't be able to share accurate data with you.
Size 6-13, brand new, only tried 6&7 once lightly
Oura Ring Sizing Kit
Oura Ring size guide: What you need to know - Android Authority
3D printed sizing kit for Oura Ring Gen 2 or 3.
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Sizing kit? : r/ouraring
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