Seamless Alloy Cylinder

our seamless steel or aluminum cylinder is European approved, it can be CE marked or PI marked, we have been selling them to Europe for more than eight years, the steel cylinder is from 2L to 20L, diameter includes 105mm, 137mm, 159mm, 178mm, 204mm, the aluminum cylinder is from 0.4l to 13.4L, diameter includes 51mm, 60mm, 81mm, 90mm, 111mm, 152mm, 204mm