This is a gasket for a Gran Tetra water bottle! 【Material and Design】 Silicone rubber is extremely superior in heat resistance and cold resistance compared to organic rubber. It shows almost no change in properties at 150°C and can be used semi-permanently. It is characterized by a color close to the genuine red-brown. It is durable. The genuine size is around 35.5mm, but this one is slightly thicker, around 38.5mm. I have about 6 Gran Tetra water bottles of different ages, and I tried putting these gaskets in each one. At first, they felt stiff, but they gradually became familiar. Of course, there was no problem washing them in the dishwasher. Although the thickness is 0.3mm different from the genuine one, please purchase it if you are okay with that. ※For those who are having trouble with gasket deterioration I made these for myself, but I have some extras, so I'm offering them at a low price! Please peel off the sticker on the rubber before use. Those who purchase two or more will get a slightly lower price. - Material: Rubber - Color: Red-brown - Color: Genuine color