These chair glides maintain a fixed position and are compatible with most Office Star Work Smart and Pro-Line chairs. They are intuitively designed to protect your floors from scratches and reduce noise. Easily attachable and arrives in a set of four. Perfect for protecting office environments and moving effortlessly with minimal sound. This product has achieved GREENGUARD Certification, meaning it is recognized as an interior product made with materials that have low chemical emissions, improving the quality of the air in which it is used.