Gunpowder, printing, magnetic
compass
, silk, porcelain,

as well as the breast strap and horse collar (massively
i
mproved efficiency of horse power eg for
ploughing cf oxen).  Not nearly as
i
mportant within China – gunpowder was not
develop
e
d
i
nto weapons

because politically very stable, printing was the exclusive skill of the
religious powers (for manufacture of religious objects). 
Joseph
Needham
asked why China was then eclipsed

i
n the modern world.  Probably because stimulation fo
r development came from intense competition between all the
warring states of Europe, plus the relative affluence in China made such
developments unnecessary.  China then
resisted the introduction of European technology as brought by the British,
because they had seen how the British had pervaded India.