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KPSI or Knots per Square Inch is the number of knots that a carpet is having in one square inch of area. Higher the number of knots, finer the carpet is and better is its look. Below 36 KPSI, a rug is considered to be low quality Between 36-80 KPSI, its medium quality Between 81 to 121 its good quality 121 to 196 is very good quality Above 200 is something, which is very rarely made these days.
