This caster is made of PP+PVC material and is a universal caster accessory for office chairs. The design of a 50mm wheel diameter and a 38mm socket diameter takes into account flexible steering and stable support. The black PU wheel surface is not only stylish and dirt-resistant, but also has excellent wear resistance and a quiet effect, which reduces rolling noise and effectively protects the ground from scratches. The PP+PVC material gives the caster good strength and toughness, ensuring that it is not easily damaged during long-term use and can easily cope with frequent movement in the office environment. It is easy to install and suitable for all kinds of office chairs, bringing you a smooth and quiet mobile experience, improving office comfort and efficiency, and is a reliable choice for office chair accessories.