Gunpowder, printing, magnetic compass, silk, porcelain, as well as the
breast strap and horse collar (massively improved efficiency of horse
power eg for ploughing cf oxen). Not nearly as important within China –
gunpowder was not developed into 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 in the modern world. Probably because stimulation for 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.