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I have these on ebay really grippy champion CFR glow plastic with a awesome jimmi Hendrix stamp
I do believe the softest standard aviar besides possibly r-pro is Glow plastic. I use one as my off putter and my main is a DX aviar that happens to be super soft and grippy.
Innova seems to run different DX blends on their aviars from time to time as I've found them from super slick and stiff to gummy as hell.