lines and knots count

This picture shows the back of 260 lines hand-knotted Persian silk carpet z201307. 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(knots count is 470KPI). For this quality hand-knotted silk rug, eachperson can make around 2.25 square feet per month.