-Consists of -304 stainless steel for hygienic use. - You can easily plug the straw by adding plastic to the inside, and it is convenient to move it because it is designed to prevent the separation of the straw. -It has a distorted structure, so you can hold it stably because it has a good grip when you hold it with your hands. -Rubber is attached to the bottom, so it can be placed without slipping. -The internal copper plating process keeps the temperature better than other products. - Do not cause a strong impact on the product. -Keep away from the firearm.