the back of 260lines hand-knotted persian silk rug

This picture shows the back of 260 lines hand-knotted Persian silk carpet z185283. The knots are very clear and dense. There are 22 lines ofknots per inch and there are 470real tied double knots per square inch (470KPI). For this quality hand-knotted silk rug, each person can make
around 2.25 square feet per month.