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

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