Made
of selected materials, smooth rotation. Tough rubber/ppcp to with stand
wear & tear, steel balls HCHC/CS, axle, cone, cups, hardened, threading
9\16" or 1\2" x 20 TPI & also m14 x 1.25 pitch
PLASTIC
MTB Old / New, BMX Small
/ Big / Round, Kid, Piagiao, V - Shape