Product Name : VITAVON HD Steel Wider+30mm CVD Shaft Set For Traxxas Wide X-MAXX 1/5 2 Pairs
Brand : VITAVON
Color : Silver

30mm for Wide Xmaxx, Made of HD 45# Steel, comes with #7075 hubs and Screw Caps, 

Sells 2 pairs, 4pcs for one Truck. 

Fits for both XRT and X-MAXX wide kit.

https://youtu.be/i6iUXgm6148