Introduced with the range refresh in 2010 and still used almost exclusively on Black Panther snares well over a decade later. From Mapex

The all new Mapex Sonic Saver™ Hoop bridges the gap between flanged hoops and die cast hoops. The unique shaping process creates a profile that reduces wear and tear to both sticks and hands while dramatically enhancing the response and feel of every rimshot.The all new Mapex Sonic Saver™ Hoop bridges the gap between flanged hoops and die cast hoops. The unique shaping process creates a profile that reduces wear and tear to both sticks and hands while dramatically enhancing the response and feel of every rimshot.

The Sonic Saver™ is significantly lighter than a conventional die cast hoop, it wont choke the shell’s vibration. The result is a more natural percussive sound with much greater resonance.

Yes, we get it Mapex, it's supposed to have the ™ symbol every time, but it's annoying to keep doing that, so you won't see it used much in the database.

Note the logo change in the hoops post-2012 when the new "M" Logo came in: you can see it change in the catalogues 2013+. There's no difference in the hoops themselves, but it does help date your snare if you have one of the early examples of the 2010 range. Good spot by Alex Wicheard!