Brass body and cap, stainless steel ball and 24 mesh stainless steel screen.
Also available in aluminum, polypropylene and stainless steel and with different psi rating and mesh size. The 4193A strainer check valve provides a dual function of protecting the orifice tip from clogging as well as preventing dripping from the nozzle after line pressure is shut off.
I use this on a lawn tractor sprayer. I have finer mesh further up in my system, I use these for the check valve feature to minimize unwanted drips from my wet boom to spray my 1-1/2 acre yard.