this means the roller has a long life and will keep your door quiet. a quiet door is more than just a convenience, but it is a smoother process that will help your garage door last longer than it may have otherwise lasted. check out your current roller and see what condition it is in, or listen to your door and see how loud it is. if it is time for a replacement, this 13 all bearing roller could be the perfect solution for you. designed for a 2″ track, this roller is the ideal solution for all your roller needs. 