These drone strikes are being done by the Ukrainian made 8-motor quadcopters that they assemble from kits. The "bombs" are plastic bodies (to reduce loaded weight) with fixed plastic fins (made from sheet plastic found in craft stores), with a metal nose cone and "percussion/striker" detonator. The bomb's payload is 1/2lb of explosive and 2lbs of fragmentation material (everything from gravel to small metal fragments). The smaller drones can carry one or two bombs but the larger one Ukraine has started to make is capable of carrying up to 6 bombs. The control range is a few kilometers and the controller is a STANDARD (ie commercially sold) controller.
https://youtu.be/XQ4HxpQQ3Sg
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