The PP Mi-D mine is a Czech copy of the German Second World War Schu-mine 42 anti-personnel mine. It consists of a simple wooden box with a hinged lid that acts as the trigger mechanism. A slot is cut into the side of the lid which rests on the striker retaining pin. The main charge is a block of cast TNT into which a variety of fuzes may be placed, typically either the RO-1 or an MUV series fuze. There are also sometimes two holes drilled in the front of the box that accept wooden pins, either to prevent accidental detonation when laying or to increase the operating pressure.