This compact rack is fitted with 4 long-wear tubular stainless bars. two of which are tie-off bars. This rack design allows the user to vary the friction without adding or dropping bars or disconnecting from the system like traditional racks. whether it is being used in a controlled. fast single person rappel or a heavy rescue lower. As more professional trainers begin to expose their clients to the benefits of this alternative style rack. it is clear they are growing in acceptance and popularity. Certified to NFPA 1983/2001 edition.