This is a replacement gasket for a Marukiru water bottle! 【Material and Design】 Silicone rubber is far superior to organic rubber in terms of heat and cold resistance. 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 reddish-brown. It is more durable than the original. I own about 15 Maruka water bottles of different ages, and I tried fitting these gaskets on each one. They felt stiff at first, but gradually became more comfortable. Of course, there was no problem washing them in the dishwasher. ※For those having trouble with deteriorated gaskets 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. I'll give a small discount for purchases of two or more. - Material: Rubber - Color: Reddish-brown - Color: Genuine color Thank you for looking.