1. Steel with a surface that is much harder than the interior metal

Type of: steel

• Cassia fasciculata
• Cassia fistula
• Cassia grandis
• Cassia javonica
• Cassia marginata
• Cassia marilandica
• Cassia occidentalis
• Cassia roxburghii
• Cassia tora
• cassia-bark tree
• cassie
• cassimere
• Cassin's kingbird
• cassino
• Cassiope
• Cassiope mertensiana
• Cassiopeia
• Cassirer
• cassiri
• cassis
• Cassite
• cassiterite
• Cassius
• Cassius Clay
• Cassius Longinus