The wings were made of concrete, cast around a steel core.

It was replaced in the 1960s by a structure with a steel core.

As though the past two years had tempered a steel core of strength inside her soul.

His character had been honed down to its steel core.

From the bedrock up, a central steel core runs through the center of the structure and is its main support.

These make up the steel "core" of the 887.

Also make sure that the steel core has at least three layers of tape over it.

He'd first respected her steel core, then grown to love that about her.

The observations suggest that the building's steel core somehow gave way first, pulling down the rest of the tower with it.

The clubs were constructed of hickory-shafts with a steel core.