Compatible with the kit, enabling users to easily determine their ideal ring size (Note: Using lubricating facilitate easier wearing). Users simply follow the instructions on the measuring card, placing it on their finger or directly measuring the finger's circumference to find the corresponding ring size. Position the sizing tool at the base of your finger to prevent it from freely. We recommend wearing it for over 24 hours to determine the most accurate size for optimal data and comfort. Suitable for all fingers, whether left or right. Choose the ring size based on the exact size of the finger on which you plan to wear the ring. The measuring card is precisely designed to users can measure accurately, avoiding discomfort caused by incorrect sizing. Color: As Shown Material: plastic Package Contents: 2 pcs * kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.