They are cheapβand surprisingly effective

Grenades are lightweight because they are designed to be thrown. However, when they are dropped from drones, this can be a disadvantage. Grenades, with a normal weight of only 300 grams, lack “killing power,” according to “Lyosha,” an amateur weapon-maker based in Kyiv. According to him, targeted Russian soldiers “often just keep running” after one goes off.
Lyosha and a group of friends created an alternative three months ago while working from home: an 800-gram anti-personnel explosive known as the “Zaychyk,” or “Rabbit.” The gang employs 3D printing to create the bomb’s casing before filling it with C4, an explosion, and steel shrapnel. According to Lyosha, this shrapnel rips through wooden planks “like butter” in tests.