MakerBot X-End Aluminum Idler With Bearings Installed

X-End Aluminum Idler With Bearings Installed .
This Idler kit will eliminate the need for greasing the idler.
Aluminum GT2-16T .Bearings rated to 6000rpm's
304 stainless steel shaft and 2 SS-washers .Shaft dia 4mm.
http://www.almgear.com/