we are the main producer & OEM of the automotive catalysts in Iran with a production capacity up to 1.500.000 catalysators! We are coating under the German Technology & Licence! Our aim is to import ceramic & metallic substrates & export automotive catalyst converters! Automotive Ceramic Substrates: 1) Monolith's Sizes: 68.07 x 99.82 x 120 mm. ( 400 CPSI / 6.5 ) 2) Monolith's Sizes: 68.1 x 144.3 x 112.3 mm. ( 400 CPSI / 6.5 ) 3) Monolith's Sizes: 80 x 170 x 152.5 mm. ( 400 CPSI / 6.5 )