Light weight moving parts
Fantastic option from the start on building accompanied with Tamiya alloy central prop shaft
Added with ball race bearings you have a cool working part and ideal from ware and rear from the standard plastic part and plastic bearings
If your using more battery juice than normal highly recommended
10/10 Tamiya high performance part
I don’t build a kit now with them
But it is personal choice of course
I’ve tried lesser brands but no way near the superior quality you Get with Tamiya