Almost anything you like. 125 cm * 250 cm * 100 cm of vacuum (or interstellar material) and the mass is near enough 0.
On the other hand, 125 cm * 250 cm * 100 cm of a neutron star will have a mass of many many tons. So pick your substance and you will get almost any mass you like.
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A metre is 100cm
1m = 100cm 16.2m x 100cm/m = 1620cm
x1000000. 1m cubed= 100cm x 100cm x 100cm = 1000000 cubic cm.
75cm 1 meter = 100cm 1 meter = 1000mm 750mm * (100cm/1000mm) = 75cm
100cm = 1 metre