The term "Razor Rollers" is conjectural. The real name is unknown, and a non-canonical nickname or title is used instead. See the reasons for this title in the "Behind the scenes" section below and/or the relevant discussion on the talk page, if there are any.
Razor Rollers were Kerchus which piloted a ball with razors on either side that would flatten Ratchet if he hit them. The Kerchu Guardian could deploy them if you are on the floor of the arena.
Razor Rollers can't be attacked while in ball form; therefore, use weapons like the Buzz Blades and the Shard Reaper while they are standing normally.