FITTR HART Sizing Kit I Confirm Size Before You Buy I Choose from 8 Sizes and 3 Colours

FITTR HART X2 Smart Ring Sizing Kit - Confirm Size Before You Buy - Choose from 8 Sizes

GABIT Smart Ring Sizing Kit | Size First Before You Buy | Includes 8 Sample Ring Sizes for Men, Women | Tracker for Health, Fitness, Steps, Sleep, Stress, Workouts, Sports, HRV, SPO2, Temp & Nutrition