Dented bamboo knitting needles

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I just bought a set of interchangeable bamboo circular needles (by Addi). I've only had them since Saturday, and I notice they're already getting dented, presumably just from rubbing against each other. I'm not a particularly tight knitter. I just googled this problem and it seems like some knitters constantly experience it whereas others never do ... can anyone here shed any light? Has anyone found good ways to avoid it? These needles weren't cheap 😕

Thanks Stitchit ... the needles were brand new on Saturday and before I started using them were stored in a special case, as part of an interchangeable circular needles set, so the problem must have arisen from a day and a half of use :( I really like them otherwise - I like the feel of the bamboo. The dents aren't huge, but still ...

Thank you, this is really helpful! I've contacted the seller and explained the situation. The needle set was not really cheap, and was a real treat to myself so I'm keen to get it sorted. If it was just a single set of needles I could overlook it!

Sorry, I've only just seen your post, Stitchit! The seller did offer a refund or exchange but in the end I decided to keep them. The damage didn't really get worse as I used them more, and the other needle sizes in the set don't seem to suffer the same problem (though I haven't used them as much). I do like the needles and am using them currently for a project so would have been a hassle to return the whole set. I figured that at worst I can just replace the 5.5mm ...