I ordered a rim from Bob Reeves. By ordering a flat wide rim with an inner diameter of 41, I believe it reduces the pressure on the lips, significantly improves stamina, and allows for efficient lip vibration. It is compatible with other Bob Reeves products, so it can be used with any model that allows for rim detachment. This is a custom order, so it will not be available for sale, so please consider purchasing it! Rim creation cost: ¥34,760 total