Features:
High Accuracy: The measuring card is precisely designed to ensure users can measure accurately, avoiding discomfort caused by incorrect sizing.
Compatibility: Compatible with the Oura ring sizing kit, enabling users to easily determine their ideal ring size (Note: Using lubricating oil can facilitate easier wearing).
Measuring and Size Verification: Position the sizing tool at the base of your finger to prevent it from spinning freely. We recommend wearing it for over 24 hours to determine the most accurate size for optimal data and comfort.
User-Friendly: 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.
Finger Selection: 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.

Material:ABS
Color: white
Size:15 * 11.1 * 1cm
Package Included:Size Kit for 1 * Oura Ring 4

Note:
1. Due to the light and screen difference, the item's color may be slightly different from the pictures.
2. Please allow 0.5-2 cm differences due to manual measurement.