Tong Zi Jian (筒子箭)

Drawing of a Tong Zi Jian (highlighted), from 'Wu Bei Zhi (《武備志》)'.

Tong Zi Jian (筒子箭, lit. 'Tube arrow'), also known as Tong Jian (筒箭), was a large, open-ended bamboo tube that contained fifteen to twenty darts, sometimes poisoned. This weapon was supposed to be launched by hand, although the proper method of using it is yet unknown.