OURA Ring 4 - Stealth Size 5

TCH R20 iRing - Ring Size 7 Silver 220 mAh

OURA Ring 4 - Stealth Ring Size 6

Ultrahuman Ring AIR - Size 12 Space Silver

Ultrahuman Ring AIR - Size 9 Space Silver 6 Days Battery Life

Porodo FitSync Smart Ring - Ring Size 7 (17.3mm) IP68 Water Resistant 16mAh

TERRIFI Smart Ring Health Tracker - IP68 Ceramic Body 5-7 Days Battery

OURA Ring 4 - Brushed Silver Size 10

Ultrahuman Ring AIR - Size 8 Aster Black

Ultrahuman Ring AIR - 6 Days Battery Life Aster Black Size 9

Ultrahuman Ring AIR - Size 11 Aster Black 24 mAh