Different colors: White, black, red yellow, gray, brown, etc.
Metal retainer: Plane(track) type, grooved(track) type, convex(track) type or even without retainer are available
Application:
Sliding door, window, drawers, conveyors, toys, sporting goods
Furniture, folding doors, shower door, curtain, rowing machines, filing cabinets
Refrigerator drawer, aluminum windows, etc.
Nylon bearings as per customers' drawings