Carrie turned over 60,000 miles yesterday, and picked up a new new rock chip as a present. And when I say rock chip, I really mean rock gouge. From the inside it looks like a 1 inch by 1/3 inch oblong pit but outside it’s definitely a ball sized dip. It’s up in the top corner passenger-side so doesn’t obscure my view but I am a little worried about it spreading. Two MINIs owned, four windscreens and more rock chips than I can count. What do they make these windscreens out of – glass??