EISCO 12PK Bristle Cleaning Brushes with Fan-Shaped Ends, 9.25" - Twisted Stainless Steel Wire Handle - Ideal for 0.3" - 0.5" Tubes, Bottles, Cylinders, Flasks, Straws

Just what I needed to clean the tubes of my pellet stove.

This EISCO 12PK Bristle Cleaning Brushes with Fan-Shaped Ends, 9.25" is really a pack of test tube brushes. Think of the size of a test tube and that is what they are best at cleaning. They are well made. The bristles are pretty stiff and the fanned end is pretty full. They will get rounded ends cleaned out well. They have other uses. I am using them to clean out a sprayer from a two part poly. Once it starts to harden, it can't be dissolved, so only a good mechanical cleaning will do, and the brushes get gummed up. So, these are excellent for that purpose also. They are probably too large and stiff to clean drinking straws, unless they are pretty large diameter.

I thought the diameter on these brushes was smaller than they were so their use ended up being a bit more limited for me. That doesn't mean I couldn't find a way to put them into service, and so far they've been decent enough. They're able to scrub away stubborn bits of gunk, though I noticed one had some of the bristles look like they fell off so I'm not 100 percent confident in their long-term durability.

The little wires come out and end up on everything. Skip this one.

Seemed like a cheap product