Mars Gaming MM218. It's entirely possible that these mice come from different factories, by the way, yet they're all Motospeed. Motospeed is a pretty big OEM.
Mice currently owned: Logitech G402/G403/G303/G Pro, Zowie FK1/EC2-A/EC2-B/ZA12, Razer Deathadder 2013/Basilisk, Cooler Master Mastermouse S/MM530/MM520, Roccat Kone Pure Owl-Eye, Dream Machines DM1 Pro S/FPS/DM3 mini, EVGA Torq X3/X5, Ninox Venator, HP Omen 600, Thermaltake Ventus X RGB Optical/Ventus R, Microsoft WMO, Steelseries Rival 310, Nixeus Revel, Ozone Neon M50
Looking to buy and try: Ninox Astrum