It is a Zeno spur gear. but it is not packed in a bag.

It is a Zenon spur gear that boasts an overwhelming share as a general-purpose spur gear with high roundness. durability. and freedom of gear ratio.
In direct drive cars such as 1/12. the diff ball positions are staggered one by one to suppress blurring without sacrificing diff operation.
Also. in touring cars. the spur gear mounting holes differ depending on the model. so if you try to stop it forcibly. the spur gear will be distorted and you will not be able to obtain the original accuracy. but if it is made of Zenon. you can use it with high accuracy because it can be stopped reasonably ..