The cylinder is made of some sort of high carbon steel that was then surface treated by a process similar to Parkerizing (from what I understand). It has a nice smooth, black finish with the RAVEN PDI mark printed in off-white on the handle end of the cylinder. This cylinder, like the rest of the PDI cylinders, is a different ID compared to Laylax and the stock cylinder therefore requiring the use of PDI or custom made pistons. Two major things of note