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[Kanji] keystone T-shirt A stone or stone that sits at the top of the center of a brick arch. Since wedge stone contains titanium (Ti), it is also called titanium stone. Japanese calls Kusabi-Ishi.

A stone or stone that sits at the top of the center of a brick arch. Since wedge stone contains titanium (Ti), it is also called titanium stone. Japanese calls Kusabi-Ishi. [Kanji] keystone long sleeves T-shirt