Steel rollers are common on older garage doors and can be a bit noisy. Some economy style doors run with plastic rollers which can wear out quickly and will need to be replaced over time. The 13 ball bearing nylon rollers are the quietest and they are durable. We recommend the 13 ball bearing nylon rollers for smooth operation and longevity. Hutchins uses nylon rollers in 99% of our residential installations and repairs.