MATERIAL: These rod casters are made of polypropylene (PP) and steel LOAD CAPACITY: 40kg per caster, the construction of the caster is sturdy and durable SIZE: The rod is 8mm in diameter and 38mm in length. When used with the attached socket, it ensures a secure fit. SMOOTH OPERATION: Ball bearings and 360 degree swivel casters allow you to move heavy furniture freely when needed, the smooth PP surface prevents scratches on the floor PERFECT FOR: Furniture projects and replacing old, worn casters. The antique brass color provides a vintage look and matches your kitchen cart, laundry cart, accent chair, office chair, end table, coffee table, cabinet and pull-out bed. Product Description QUIET STORAGE The bottom wheel is made of PP, which effectively reduces friction noise