Harrows UFO

I found these while rummaging through a box of old darts stuff; I don't think I ever used them. I'm pretty sure they are Harrows, probably mid-'80's to early '90's vintage. Length 50.1 mm, diameter 7.8 mm, weight 27.29, 27.43, and 27.56 g. Although they look like something the Michelin Man might throw, they actually fly pretty well. Any ideas about what they are?

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