Package Includes: 2 sliding door wheels and 2 mounting parts. High Quality Material: Made of high-hardness ferroalloy, thick material, not easy to deform, sturdy, durable, wear-resistant, and corrosion-resistant. Pulley Design: Which provides better fit and smoother sliding, stable and safe to use. These accessories allow you to open the closet door more conveniently and easily. Quiet Operation: With the damping buffer, they would operate quietly and robustly, protecting you from the loud noise and potential injuries caused by the sudden slamming of the door. Wide Usage: Fits sliding doors of wardrobes, windows, closets, cabinets, display cabinets and shoe cabinets, cabinet doors, etc. And is an ideal replacement for your traditional rollers.