Original: The cocoon is made of a thread of raw silk from 300 to about 900 meters (1,000 to 3,000 feet) long.
Simplified: Silk The cocoon is made of one thread of raw silk from 300 to 900 meters (1000 to 3000 feet) long. About 2,000 to 3,000 cocoons are needed to make a pound of silk.