bike brakes

I went for a ride last week and my brakes were squeaking like crazy so I finally decided it was time to replace them. With the sound they were making I was expecting to see nothing left on the pads but there was still material. any recommendations on what to get for a replacement? I ride trails a couple times a week, nothing crazy.

Rear (already had been replaced a couple years ago):

Illustration for article titled bike brakes
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front (i think these were original):

Illustration for article titled bike brakes