Ugh! They are wheel weights but fitted by morons!
Those kind of weights are for steel wheels - Alloy wheels should have stick-on weights or you'll risk scratching up the rim surface!
And the clip on is supposed to go on the inside of the rim anyway, not the outside! (So a) you don't see it and b) if you kerb the wheel there's less risk of damaging the rim or tyre sidewall!)