Thank you for viewing. This is the Oura Ring sizing kit "JZ98-0030". It is an authentic product. This ring sample set can be used to check the size for both Gen2 and Gen3. [Contents] ・Set of plastic ring samples (sizes 6-13) *Please adjust according to the actual product ・Outer box: Yes (Please adjust according to the actual condition of the product) [Condition] I only tried it on my finger a few times to check the size, and it has been stored at home. There are no noticeable stains or damage, but please forgive any minor scratches as it is a used item. [Please note] ・This product is a sample for size confirmation and is not the actual measurement ring. ・Please refrain from purchasing if you are nervous or looking for a new item.