Thank you for viewing! This is a silicone bottom cover for water bottles to protect the bottom from impact. It's made of silicone material with excellent elasticity and flexibility. If the size fits, it can be used not only for water bottles but also for glasses, cups, etc. It can be washed thoroughly if it gets dirty. 【Product Details】 Material: Silicone Size: Diameter 65mm, Height 18mm (Suitable for water bottles with a diameter of 65-70mm) Color: Clear Quantity: 6 pieces This is three sets of the product, which I purchased for about 500 yen for two pieces. I've only used it a few times inside the water bottle cover, so I think it's in good condition as shown in the photos. Thank you. Silicone cover for vacuum insulated mobile mugs, bottom cap, water bottle protective cover, non-slip, noise and scratch prevention, silicone, 65mm, clear, set of 6