The bristles are soft, flexible and move well, penetrating cracks and glass edges without damaging the seams or the glass. I like that they are light and comfortable to hold. Reliable quality and fast delivery are important to me. I ordered these because I'm going back to stained glass and these brushes aren't what I'm used to. I think they will last me for a long time, probably a year. I don't just throw them away a lot, they have to wear out. I will update after use. Weller has a pretty good reputation as a brand, I have several tools from this company and am happy with them. At the time of writing this review this pack of 25 high quality lightweight flux brushes cost under $16 including fast shipping. 5 Stars.
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