The top and bottom sides of all hand-woven rugs end to fringes. These fringes are the most essential and main structure of a rug due to the fact that woven piles might be loosened from these two sensitive parts. Therefore in order to avoid loosening of these parts, the weaver should fortify these ends by extra double knots of two or three adjacent warps. Consider a rug with the following dimension: 5 feet wide and 8 feet in length. It means that the rug has four different edges. The two edges from the width side contain fringes (each side 5 feet fringes). An average of 700 to 800 double knots is needed to strengthen each side of this rug to prevent the gradual loosening procedure of the main colorful piles.