That’s literally all it is, and the neoprene rubber suppressor covers were just HVAC pipe insulation. I have gotten neoprene suppressor covers that still had the specification numbers all over them. Like they just came off the shelf at Lowe’s.The one that came with mine many years ago just appeared to be a short piece of black rubber automotive vacuum hose. Lifetime supply at any Autozone for less than a buck a foot.