tonearm cable, do you need one?


I recently got a VPI classic 3.  It has regular RCA outputs.  All the arms I've used have always had built in wire with a ground on the end that hooks to the ground on the phono preamp.  The VPI has a ground lug and I see RCA tonearm cables have grounds on both ends.  How important is this?  Do I need a tonearm specific cable?  
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Thanks Ralph @atmasphere . I think I may have known that but its been a long time since I had an arm without the captive cable. Its good to be reminded of error. But don’t tell my wife I said that. (-:
The VPI cables are made using the same Discovery wiring that the VPI arms are wired with, that is unless it is the upgraded arms with the Valhalla wiring. There are those who believe as I do that the combination would have a given synergy. Enjoy the music
"I don’t need one, I have 3."
How special! What does that have to do with the question that was asked from the OP? Nothing!
Low capacitance, screened, relative flexible and not too heavy.
For ground you can use any piece of wire made from good copper.
You may benefit by using the same kind of wire, silver or copper, that is in the arm tube.

G