This is a sizing kit for the old type (3rd generation) OURARING. According to those who have used it for the 4th generation, it seems that sizing with this kit was not a problem. Model number is JZ98-0030. ● Other notes: ・Please purchase only if you understand that this is a used item. ・It will be wrapped in packing material and waterproof/stain-proof vinyl, and then packaged in a paper bag or cardboard box for shipping. ・Please note that the shipping method may change. ・We plan to ship within 1-3 days.