This 6” x 2” Rubber on Iron on Rigid Caster Featuring weight capacities of 350 to 2100 pounds per wheel, the 80 Shore A black rubber is chemically blended to an iron wheel core and has an operating temperature range of -40 to +180 degrees Fahrenheit. This Caster administers proper floor protection and silent movement, it is an economically amiable wheel that gives decent resistance to shock and vibration. This wheel is not suggested for applications which operate where water and/ or is in attendance.