Neck ring with PCM material that warms the neck at 48℃ Warm Neck Ring M How to use: Heat for 6 minutes, then reusable Although it is new and unused, the storage condition was not good, and dust has accumulated on the case. Some may have gotten inside as well. Will be shipped via Yu-Yu Mercari delivery. Due to its thickness, it will be packaged without bubble wrap. Please refrain from purchasing if you are sensitive to such things.