A bombilla is a filtered straw for drinking yerba mate. In Spanish, it means "small pump." Indigenous peoples like the Guaraní used to make straws by cutting thin bamboo or reed stems, but Spanish conquerors began manufacturing them with silver, which was abundant in mines. Today, in addition to silver, they are also made from metals such as alpaca (called "alpaca" in Spanish) and stainless steel. They are typically 15-20 cm long and have a tube diameter of less than 1 cm, excluding any decorations. Material: Stainless steel To cool the hot yerba mate as you drink it,工夫 (kufū - ingenuity/effort) is made by attaching a metal ornament in the center of the straw part or by adding grooves to the straw's surface to increase the surface area and facilitate heat dissipation. Please understand that this is an overseas product and purchase after carefully examining the photos.