A size can be constituted-of-or-filled-with some millimetres.
An average can be constituted-of-or-filled-with some millimetres.
A thickness can be constituted-of-or-filled-with some millimetres.
Some millimetres can be constituted-of-or-filled-with water.
Some millimetres can be constituted-of-or-filled-with precipitation.
A rate can be constituted-of-or-filled-with some millimetres.
An overall length can be constituted-of-or-filled-with some millimetres.