Exodus 36:14-18

Then he made curtains of goats’ hair for a tent over the tabernacle; he made eleven curtains in all. Each curtain was thirty cubits long and four cubits wide; the eleven curtains were of equal size. Bezalel joined five curtains by themselves and [the other] six curtains by themselves. He made fifty loops on the edge of the outermost curtain in the first set, and he made fifty loops on the edge of the outermost curtain of the second set. He made fifty bronze hooks to join the tent together into a unit.