My grade 12 history class took a trip to the Military Museum in Calgary. They showed us a inert bomb. It looked like a butterfly, and was a bright green. The sole purpose was to look like a toy so kids would pick them up and lose an arm/leg. They were not really powerful enough to blow a person up, just to maim the person. They had a fuse that was armed by shock, so they would drop them out of a plane, they would hit the ground and the shock of hitting the ground would arm them. They would also flutter down, like a butterfly. Brutal, really brutal.