ロックウールだろう
rokkūurudarō
1. Probably rockwool.
★ Common
Noun
#233392
1. Probably rockwool.
1. lock
2. lock (in rugby); lock forward
1. rock (music)
2. rock; boulder
3. on the rocks (drink)
1. wool
1. automatic lock
2. automatic door-locking system
1. hard rock
1. rock wool; mineral wool
1. Little Rock
1. seems; I think
2. right?; don't you agree?
1. It will likely be beautiful.; It must be beautiful.