This brush has nice natural bristles-not too soft nor too stiff. I use them for cleaning the glass pipette to reuse tincture bottles, straws and all sorts of narrow glassware. So thankful that this brush is all-natural; it is so much nicer to clean with than the kind with grody plastic bristles.
My only complaint about this straw brush is that I didn't find it sooner!
I've been holding out for one that was totally recyclable/biodegradable (and reasonably priced)... this is it.
One thing to keep in mind: this will work great for standard size straws, as the brush head is fairly narrow. However, we have the jumbo silicone straws (slightly smaller than boba-size?) and a fatter brush head would be more convenient BUT this one works too. It gets the job done, dries quickly, doesn't take up much room on the counter. Love it 👍🏼