The Prime Line Twin Pocket Door Roller, Top Mount features tandem roller design and comes with twin nylon rollers.
User submitted picture of pocket door roller.
1" diameter plastic wheels Adjustable bracket is designed to mount on top of door Fits 1-3/16" center to center double "J" track systems Top mount on Convex roller edge type Plastic roller material 1"
Pocket Door Rollers INCLUDING NATIONAL
Another interesting type of sliding doors - antique doors painted on rollers
Door rollers attach to cabinets and prevent pocket doors from turning inward too soon. Hard plastic rollers install in minutes and also help .