is made of
革でできてるんだ。
It's made of leather.
人生は出会いと別れでできてるんだ。
Life is all about meeting people and saying goodbye to them.
この小屋は丸太でできてるんだ。
This cabin is made of logs.
その玩具は木でできてるんだ。
That toy is made of wood.