Inside barrel 4×13
Inside barrel 4×13 pouring.
Inside barrel 4×13 solidification.

Inside barrel 4×13 microporosity.

Inside barrel 4×13 porosity.

Inside barrel 4×13 shrinkage.
Inside barrel 4×13 pouring.
Inside barrel 4×13 solidification.

Inside barrel 4×13 microporosity.

Inside barrel 4×13 porosity.

Inside barrel 4×13 shrinkage.