Last night I did my weekly inspection/cleaning of my bike and I decided to take a look at my brake pads (the first time I have done it since I got the bike about 3 months ago). When I looked closely at the pads I noticed little pieces of metal in the rubber (which still looks very thick and not worn out). Is this normal? If so then what is it? Is it part of my rims? Is it something that the company puts in the pads?
Thanks in advance for any help,