I already have another brand of straw cleaning brush, but it's very stiff and only works on the straight straws on my sports bottles. I recently bought several stainless steel straws that are bent at an angle, and my stiff brush could not clean the bend. So I ordered these cleaning brushes, which are flexible enough to follow the bend and clean it thoroughly. The brush also has a rubber tip so that the end of the metal stick doesn't scratch up the inside of my straws (this is pretty important, because interior scratches provide a nice habitat for bacteria). Since these come in a set of 2, I gave one to a friend, but I could also have kept the extra as a backup. It's nice to have the option. The price was totally reasonable, too, so I really feel like I got a bonus brush for free.These cleaning brushes work on narrow and wide diameter straws. I don't know why some reviewers are complaining that they aren't good for wider straws; you just need to wiggle the brush around the inner circumference to clean all the interior surfaces of a wider straw. It's just like brushing your teeth. No one expects a giant toothbrush for cleaning your teeth in one swipe, so why do we need a bigger straw cleaning brush for wider straws? If you really don't want to wiggle the brush that much, you could try doubling up the two straw cleaning brushes and using them both at the same time.