Joji 5 Barbells make contact with safety bars, giving off a metallic clang during workouts. In a home gym, such noise is easily damped by the use of rubber or cloth on the safety bar. Prior to ordering this 10mm thick rubber, I used 3mm rolls which also helped, but the thin rubber curled up rather quickly. This 10mm rubber stays flat and is ideal for people with their own power racks. Wish they could be ordered in any width, but 50mm works too!