Erlichada

Question about hard plastic coating on cobra superlite 4 and 5 hybrid. I just purchased a set of cobra superlite graphite irons from golfagusta on eBay. They had a 99.7 percent rating... my question is on the 4 and 5 hybrids there’s a hard, what seems to be a permanent coating around the head of the club. Not the face but at the very top, and circling the entire head, you can feel a ridge from it. Is this normal? I’m not talking about the shipping protection plastic that removed easily.