Silicone packing for the lid of the wall mug Demita. You can use it for a long time with spare parts. Wall Mug Demita https://rivers.stores.jp/items/542d02802b34920f2300085f Product Name: Wall Mug Demita Dedicated Spare Cover Packing Material: Silicone Size: Φ Approx. 65mm Country of Origin: China * "Parts" Only orders will be shipped by Yamato Nekoposu, so we cannot ship by [Cash on Delivery]. If you order the corresponding item by cash on delivery, we will cancel it. Thank you for your understanding. "