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Feedback sports make some good ones, only broken a few in years of use. think they are maybe made from Boron or Tungsten?
Park + Pedro's ones are pretty soft, tip dissapears quickly. The best ones are found in the medical sharps bin in a dental surgery! Most of them are on contract supply/return/repair/clean/reuse sort of a deal, ask your dentist if they've got any damaged ones, extremely useful in a bike shop
Very neat, looks like dentist tools in the first pic