Exodus 36:14-18

They made curtains of goat hair for the tent over the tabernacle—eleven altogether. All eleven curtains were the same size—thirty cubits long and four cubits wide. They joined five of the curtains into one set and the other six into another set. Then they made fifty loops along the edge of the end curtain in one set and also along the edge of the end curtain in the other set. They made fifty bronze clasps to fasten the tent together as a unit.