the back of 260lines hand-knotted chinese silk rug

This picture shows the back of 260 lines Chinese Persian design silk rug z205303. The knots are very clear and dense. There are 22 lines of knots 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.