I received this item, and I don't know any details about it. Diameter: 8mm. It feels like rubber, but it doesn't stretch. --------------------------------------------------- ◎ Please understand that this item is stored at home, will be packaged simply, and shipped using recycled materials. ◎ Please check the actual photos for the condition of the item. ※ Some parts may be quoted from other sites. ⚠️ I have opened the item once for inspection, so I am listing it as "Like New". #Click here for Reshica's product list 60-54 01.18