fin is part of:

fin contains:

Full expansion for fin:
    90%  1x5x3 Fin (1x4 base/1x2 top)
    85%  2x2x2 Cylinder Brick w/ 4 Fins
    80%  1x1x1 Cylinder Brick w/ 4 Fins
    50%  2x2 Plate w/ Bottom Fins/Struts