Bamboo Needle Splinters?

I have had this happen twice now with this one set of bamboo needles, I suddenly get a sharp splinter in the tip of my finger. It’s really, really tiny and the end is not shatterred in any way. It’s really strange. The darned thing hurts too!! Has this happened to anyone else? Can you stop it from happening?

If you lightly sand the needles and polish them with polyurethane or some other protectant, you should be fine.