These attractive and durable wheels feature a resilient tread of red polyurethane (90-95 Durometer Shore A) mechanically bonded to a specially designed white center of harder polypropylene. The result is a contemporary looking wheel ideally suited for hospitals, schools, restaurants, hotels and motels, office buildings or light industry.Poly-Tech® wheels are offered with Delrin® bearings, ball bearings, stainless steel ball bearings and straight roller bearings. The 1-3/8" wide wheels are available in the following series;HL, 300, and STL. You will find the 4" x 2", 5" x 2", 6" x 2" and 8" x 2" sizes offered in our cold-forged caster series: 52 Series Standard Duty Casters, General Service Casters and Medium Service Casters. In addition, you can find them in Series STA and BC.