A centrifuge tube is not necessarily a PCR tube, according to its capacity, centrifuge tubes commonly used are 1.5ml, 2ml, 5ml, 15, or 50ml. The minimum one (250ul) can be used as a PCR tube.

PCR reaction plates are 96 or 384 wells, they are specifically designed for batch reactions, based on the throughput of PCR instruments and sequencers is generally 96 or 384.

As for the skirt, this part has nothing to do with the PCR itself. The presence of the skirt is mainly based on the instrument you use. For example, some sequencers can only match the 96-well plate on the edge of the skirt, while the general PCR uses the board with and without the skirt is the same