@Clusterfrack mentioned these in another thread a while back, so I thought I would order a set for my G19 MOS.
https://www.amazon.com/dp/B076HSWXWT...roduct_details
Mine were about $12 shipped, and were sent the same day I ordered. Excellent. The install was as per normal with these things: clean with a lint-free cloth, with little alcohol, air dry, place material carefully, and smooth it in place. Then apply medium heat from a hair dryer with light pressure, over several cycles.
I like the three piece design, it installs much faster than others I've tried. The texture is pretty 'rubbery', and not rough at all (this is for my EDC). The big square is on the backstrap, and the extra small square is for under the trigger guard, and is a great idea; I find shooting Glocks that it irritates me slightly there, and this should help.
Will get to the range soon with a shooting report, but I like them so far.