Surface
Moving on to the surface coating, the top part of the mouse shell is a slightly roughened matte plastic similar to the one used on the Cougar Minos X5 and Revenger S, but maybe a bit coarser. It feels pleasant in the hands, not very tacky, but isn't at all slippery either (of course, this depends on your skin type and how readily your hands sweat). This coating is featured on the main buttons and the back panel that pretty much surrounds the side grips too.
As for the side parts, their coating is a bit different. It feels smoother, but the panels are actually textured in a way that has them provide a stable grip, and they should eliminate any accidental slips. They do the job quite well, though not as good as some rubberization would. However, this way, there is no chance of anything peeling off within a few months.
Build Quality
Thankfully, the build quality of the TUF Gaming M5 is very good, I could only make it creak a bit by pulling on the back part of the shell extremely hard. There are no other issues anywhere; no rattling, no squeaking, no misaligned mouse feet, etc.
Weight
One thing many manufacturers still don't get right with such a small mouse is the weight. This is absolutely not the case with the M5 as it only weighs 82 grams with a few centimeters of cable. The weight is equally distributed as well, so it pretty much feels perfectly balanced in the hand.