The closest current ball to the original Eraser would be the Eraser Particle Pearl (EPP).
They have the same core but with different covers.
Eraser : ACCU-Tread Pearl Reactive
EPP: PRO-Thaneâ„¢ LT Pearl Particle (which is a low paricle load ACCU-Tread Pearl Reactive)
IMHO an EPP with a 2000 grit wet sand and then Storm Step 3 or Box with some Storm Extra Shine would be nearly identical to the Original.
I don't think that any of the Flash cored balls would be as close, due to significantly different core characteristics. The Original Eraser core was more of a flip/strong arc type reaction while all the Flash cored ball I have seen have been VERY smooth arcing. I actually had a Flash Point that I was hoping would be close in reaction shape to an Eraser but it wasn't even close for me.
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STORM TRACK
formerly : Stormin1
If you get caught in the Storm Track beware it could be a Typhon or Monsoon with Rolling Thunder and Lightning Flashes that when Unleashed may send splintered Wood flying everywhere.