The above hammers are from the midrange of the piano, a little bit above middle C. The treble range of the piano consists of trichords, meaning that the sound of each note is the result of the hammer striking three strings tuned to the same pitch; this is the reason for the three grooves in the hammers shown above.
These hammers are from the high treble range, getting closer to the right side of the piano. I didn’t take any pictures of the hammers moving in the direction of the bass, regrettably. In the upper part of the bass register where the strings are wound with copper coil and become increasingly thick as the pitch gets lower, the sound is produced by striking two strings, called a bichord. The lowest notes, how many depends on the particular piano, are produced from a single string and are called unachords.
A hammer never strikes the strings the same way twice, it’s just not possible. There’s no way to touch a piano key with the exact same pressure or velocity between any two attacks, there are subtle movements with the action parts that can cause the hammer attack to vary slightly, and vibrating strings are a perpetually moving target.