Multi-channel bricks The multi-channel bricks are made of cordierite and porcelain. Its shapes are rectangular, cylinder and ellipse. For the rectangular multi-channel bricks, the size is 150mm x 150mm x 50mm to 300mm. The channels are 20 x 20, 25 x 25, 35 x 35, 40 x 40, 59 x 59, 100cpsi, 200cpsi, 300cpsi and 400cpsi. The size of cylinder or ellipse multi-channel bricks is 50mm to 150mm x 50mm to 200mm, channels are: 100cpsi, 200cpsi, 300cpsi and 400cpsi.