Hey guys, I am in the middle of switching out rotors/pads and noticed several things that are worn out on the front passenger wheel.....have not gotten to the front driver wheel as one of the lug bolts has apparently stripped and is spinning....yay. Anyways I would normally look this up myself but since the car is up on jacks, could anyone take a look at this pick and let me know what these things are and if I need to replace? Looks like I'd need to leave rotor off to do so. Car only has 55k on it but yeah these things are all crumbling.