Amnesty.
"CUBE-SHAPED SHRAPNEL
Amnesty International delegates in Gaza also found evidence of the use of a new type of missile, seemingly launched from unmanned drones, which explodes large numbers of tiny sharp-edged metal cubes, each between 2 and 4 mm square in size. This purpose-made shrapnel can penetrate even thick metal doors and many were seen by Amnesty International's delegates embedded deep in concrete walls. They appear designed to cause maximum injury and, in some respects, seem to be a more sophisticated version of the ball-bearings or nails and bolts which armed groups often pack into crude rockets and suicide bombs. The signature of these new missiles, in addition to the deadly tiny metal cubes, is a small and deep hole in the ground (about 10 cm or less in diameter and up to several metres in depth) and a small quantity of shrapnel made of very thin metal, seemingly from the missile's casing.

An X-ray of a young man who had been injured in one of these missile attacks, which killed a dozen youths and injured several others, showed the tiny metal pellets still embedded in his thigh.

A 13-year-old girl who was asleep in her bed; three primary school-age boys who were carrying sugar canes; two young women on their way to a shelter in search of safety; a 13-year-old boy on his bicycle; eight secondary school students who were waiting for the school bus to take them home; an entire family sitting in the courtyard of their home, and many others were all killed in attacks with these "
http://www.amnesty.org/en/library/asset/MDE15/012/2009/en/5be86fc2-994e-4eeb-a6e8-3ddf68c28b31/mde150122009en.html