The k-series features cordierite-based, grooved ceramic tile. it has permea...The K-Series features cordierite-based, grooved ceramic tile. It has permeable design with alternating rows of precision perforations terminating in slots. Minimum 0.045" diameter perforations. Minimum 190 perforations per sq. inch. Up to 1850°F surface temperature. Capable of reaching full intensity temperature in less than 30 seconds. Stable-flame shorter and closer to ceramic.