Those aren't artillery shells though, the explosive part of those weighs seven kilos, which is too much for the mass produced drones they use. As others mention

Those aren't artillery shells though, the explosive part of those weighs seven kilos, which is too much for the mass produced drones they use. As others mentioned, they use RPGs (3 kgs), mortar shells (~1.5 kgs), grenades (<1 kg), sometimes land mines, and specialized drone explosives for suicide drones. I do like seeing the production facilities of these drones, how they simplified the designs but also made design decisions to deal with the scale, they're built so they can be stacked easily. Mind you, this is probably the case with these drone show drones too.