BC Racing Coilover Differences

What are the differences between all the BC Racing coilovers? In this video I explain the differences between the BR, DS, RM, HM, ER and ZR Series coilovers.
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[@brettnoakes3800]

What about the differences of the ZR verse the ZX

[@nefariousracing]

What's the ZX? Never heard of those

[@ayasmohammed7838]

V1 series?