Knockout Cool Neck Ring - Brand New, Unopened A collaboration product between the balance ball chair "MAROOMS" that strengthens your core just by sitting, and KNOCK OUT! It freezes naturally in environments below 28°C, and when worn in its solidified state, this product cools your neck comfortably. After use, it can be cooled in the freezer or refrigerator and used repeatedly. A companion for this scorching summer!! 【Size】Approx. 143mm × Approx. 131mm 【Weight】135g±10g 【Retail Price: 3000 yen】 ※ Immediate purchase without comment is OK. 【Notes】 ● We check for scratches and stains, but there may be oversights, so please understand. ● Please understand that this is a private seller. ● Individual differences in perception exist, so please refrain from purchasing if you are sensitive. 【Shipping】 ※ We do not ship on weekends and holidays. ※ We will use compact packaging (simple packaging). ※ The listed shipping method may change.