Our 8' Premium track is a teardrop-shaped, heavy-duty self-cleaning track system. This unique profile has a square side allowing the track to be firmly and squarely mounted, while the rounded bottom profile allows for self-cleaning and self-aligning. There is an additional lip at the bottom of the track to add even more strength and stability. The trolleys have two rugged nylon wheels and sealed, greased roller bearings to ensure smooth operation for many years. Since there is no metal to metal contact, this system functions very quietly and the greased fitting literally allows for a “one-touch” operation. With a weight rating of 600 lbs., it easily accommodates the heft of full-metal door styles. This Premium track is, in our opinion, the best track system available on the market.