The thick shell of this species is about 20 mm in size.

The storm had buried it under a thick, hard shell of ice.

For large, thick shells a button stop or dowel pin is used.

The thick shell of metallic yet still fluid hydrogen ended abruptly.

Eggs have a thick shell, and the surface appears to be pitted except at the poles.

"It is like a fruit with a very thick shell," said Tinidril.

If thicker shells are really better for the snail, why don't they have them anyway?

However, there are advantages to having a thick shell.

Martin found a thick deep shell, blackened by fire on its outside.

Scoop out the inside of each potato, leaving a 1/8-inch thick shell.