Crank arms
Cold forged aluminum arms, square taper design, available in 165, 170 or 175mm length.

Crank arm length sizing info: The traditional length is 170mm, and works well for most
people. Generally, if you are taller, and longer legged, you might want to use a longer
crank, a 175mm size. However, for fixies there are two points to consider- cornering
clearance is decreased with a longer crank, and for high RPM riding, shorter cranks work
better. If you are on the shorter side, a 165 may work better for you. The advantage is  
easier high RPM leg speed possible with a shorter crank. The disadvantage is the loss of
leverage for climbing. So, if you're in a hilly area, the default size of 170 is usually the
best compromise.