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Changed the language to present tense since these certainly still exist (I bought some from Kmart in Australia just two days ago, and I have a set on all of my bicycles). Also removed irrelevant biographical detail about the inventor and pointed out that they come in several different shapes (at least they do now).

I would add a source for the availability of these now but I don't imagine a link to an online shopping site would be acceptable. — Preceding unsigned comment added by 120.17.19.233 ( talk) 08:59, 13 March 2019 (UTC) reply