Exodus 36:14-18

He also made curtains of goats’ hair for a tent over the tabernacle. He made eleven curtains. The length of each curtain was thirty cubits, and the breadth of each curtain four cubits. The eleven curtains were the same size. He coupled five curtains by themselves, and six curtains by themselves. And he made fifty loops on the edge of the outermost curtain of the one set, and fifty loops on the edge of the other connecting curtain. And he made fifty clasps of bronze to couple the tent together that it might be a single whole.