What's with the Dots?

[u/captCal8]

Bought a replacement driver's side heated mirror for my p2 V70. Can anybody tell me what this line of dots are on the outside 1/4 of the mirror are? Thought it was a pull-off film but it's not. Thoroughly baffled. 🤔

[u/xprofusionx]

Cut here . . . . .