1.stanless steel 2.twin wall chimney 3.silvery or painting. 4.the diameter can be 5"\6"\7"\8"....12" one chimney system includes straight pipe, elbow, tee and raincap,locking band. We can design the system for you according to your construction of your house..We use stainless steel SUS304 SUS316L. Beautiful appearance.the plate thickness is 0.5mmthe insulation is 25mm or 50mm

twist lock Chimney system