Braided line was one of the earliest types of fishing line, and in its modern incarnations it is still very popular in some situations because of its high knot strength, lack of stretch, and great overall power in relation to its diameter. Braids were originally made from natural fibers such as cotton and linen, but natural fiber braids (with the very rare exception of braided silk) have long since been replaced by braided or woven fibers of a man-made materials like Dacron, Spectra or micro-dyneema into a strand of line. Braided fishing lines have good resistance to abrasion, which is very important when fishing on rocky and similar terrains, where sharp objects can easily cut other fishing lines. Their actual breaking strength will commonly well exceed their pound-test rating.