In what units is the size distribution for blob types?

I'm trying to use the Cassandra stress tool but I don't know the unit for the size distribution for a blob column.

The blog post doesn't really help in this regard either.

So the question is when I specify a columnspec on a blob column like this:

columnspec:
  - name: data
    size: gaussian(10000..250000, 2)

What units are the min/max referring to? Is this bits, bytes, MB, GB?

If I understand this code correctly (and assuming this is where I should be looking), particularly the constructor:

public HexBytes(String name, GeneratorConfig config)
{
    super(BytesType.instance, config, name, ByteBuffer.class);
    bytes = new byte[(int) sizeDistribution.maxValue()];
}

It is initializing a byte[] with the distribution's max value.

In that case the size would correspond to bytes.