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.