【HIGH QUALITY MATERIAL】This caster features a non-marketing Pro-Tech Poly tread that moves quietly with ease while preserving the surface from streaks and scuffs. The proprietary formulation in the tread serves as a protective layer between the load and the floor making pivoting and maneuvering easy, especially in tight spaces. 【HEAVY DUTY CASTERS】: Heavy Duty Casters Diameter: 8", Width: 2", Top Plate: 4x 4-1/2, Overall Height: 9-1/2. These industrial casters are engineered, Heavy Duty Caster Set of 4 to support loads up to 4000 lbs, making them ideal for indoor & outdoor use and transporting heavy equipment and objects while maintaining stability. 【SMOOTH & NON-MARKING】High-quality ball bearings are selected to extend the service life of the bearings. Made of Pro-Tech Poly tread , these casters are non-marking, quiet, shock-absorbing, vibration-absorbing, and can effectively protect equipment and floors as well as many floor surfaces. 【WIDELY USED】These Caster are Non-Marking. Polyurethane Wheels are mainly used in Hospitals, Food Service, Bakeries, Schools, Laboratories, Animal Labs, Clinics, and many institutional applications. 【WE CARE FOR YOU】：Heavy duty casters come with friendly customer service. If you have any questions, you can contact us for a solution, we will definitely provide you with a satisfactory solution. Industrial Caster