persian sclear and dense knots on the back

This picture shows the back of 260 lines geometrical layout hand-made silk carpet z248312. The knots are very clear and dense. There are 22lines of knots per inch and there are 470real tied double knots per square inch.The knots are clear and dense. For this quality hand-knotted silk rug, each person can make around 2.25 square feet per month.