Quiet and Smooth Operation: These window rollers are made of white nylon for safety. Quiet, quiet and easy sliding, eliminating the problem common with metal rollers and ideal for homes and offices that require a peaceful environment SUSTAINABLE MATERIAL: Made from recyclable nylon and aluminum, these rollers ensure a sustainable life while maintaining a high condition, making them ideal for environmentally conscious consumers EASY TOOLS AND EASY INSTALLATION: Designed for quick setup without the use of additional tools, these rollers simplify installation even for hobbyists and rentals with limited fixing skills STRONG WEAR RESISTANT: The combination of nylon and aluminum provides superior abrasion resistance than standard rollers for users who frequently open and close windows UNIVERSAL WINDOW COMPATIBILITY: Works seamlessly with different types of windows such as double windows and casement to meet a variety of architectural styles and functional needs, Manufacturer: Netbiio