Oura Ring 4 - Black - Size 13 - Size Before You Buy

Ringconn Gen 2 Air, Ultra-Thin AI Smart Ring, 10-Day Battery Life, Fitness/Sleep/Stress/HR Tracker For Women&Men, No App Fee For Standard Features,

Oura Ring Gen3 Horizon - Black - Size 12 - Smart Ring - Size First With Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness

Oura Ring 4 - Silver - Size 11 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate -