A bombilla must have a way to clean it. If not, the yerba residue will molder and rot, making the mate taste terrible. I don't know how people can tolerate anything else. Likewise a bombilla should have a straight stem, to allow interior cleaning. I use a bristled pipe cleaner to scrub the inside of the stem. This model meets both criteria, my only quibble being the the top is too flared to get the cleaner all the way through. I like to drink cold mate (tereré) from a guampa (cow horn cup), Paraguayan style. You need a longer bombilla for this and this Deluxe Traditional model fits the bill. I only wish it were possible to buy a bombilla that is made in a first world country where purity of materials is guaranteed.