20lb. Fast Speed Blueline is an ammonia developed paper provided by Plotter Paper Guys. Optimal for reprographic printing, this time tested Blueline – Diazo Paper sets the standard for line density and clarity. Our 24″ X 150′ rolls can be trusted to achieve the best possible results for reprographic or Diazo reproductions. Plotter Paper Guys product number 510M24150 contains 4 rolls per package.