The ones at Towerhobbies are prebuilt and with bearings, too, so I guess Mike can get the same type for you, Dafni.

wow, I thought I'd never hear a comment that was not in UE's favor. From the packing list, it was my understanding that within my UE Spyder6s, the gears are OFNA to begin with. I also didn't expect to see the recommendation for plastic cases over aluminum. I'm afraid of hybrids with the number of obstacles my MT has encountered. Am I being too concerned about the durability of the hybrid bulks?

the hybirds are stronger than the others. That is just my opinion. So for a serious bashing and crashing I would say get them.