Dull, aching, poorly localized pain is transmitted by which nerve fibers?

C FIBERS: unmyelinated, slow (0.5-2 m/s), transmit dull, aching, burning, poorly localized chronic pain ('second pain'). A-delta fibers (thinly myelinated, 5-30 m/s) = sharp, acute, well-localized 'first pain.' A-beta = touch/pressure. A-alpha = proprioception/motor.