Like everyone noted those are gear motors. There are many brands. Ones that come to mind are Pittmann ( most common in the US), eScap and Maxxon.

Pittman versions that I've opened used zinc alloy gears, bronze bearings. Usually fairly robust. Don't believe they'd wear out that quickly.

There are more and more coming out of China, some are superb quality, some well, aren't.

Higher end types, Maxxon, eScap use better grade materials, gears and ball bearings but a single unit can cost many times more than
the lower types.

I've used them for years as turret drives, elevation motors and the like. I happened to be able to scrounge quite a few years ago so I got mine
for little money. With the current crop of readily available gearboxes for tanks I don't see many reasons to use these unless you have or find a
supply of suitable cheap units that beat the cost of a regular gearbox by a wide margin. Being sealed against dirt and somewhat quieter aren't enough reasons IMHO. The work to modify the output shaft in most cases and the tank itself to use one of these is just extra work. If they do break or
wear out you stand little chance of being ale to fix them. The motor end is sometimes available separately from the gearhead but finding them
is difficult; usually only from a specialty supplier from whom you will pay a first cabin price.

Unless you just want to be different I'd use a standard gearbox.

Jerry