Billy Ray,
My friend just had a Rolling Thunder drilled, sky blue-ish colour, for mid-dry condiction.
If I remember it right, it doesn't have any marking for the mb, so I guess it has a symmetrical core.
p.s. I live in London, United Kingdom, so Rolling Thunder may be an oversea ball.
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It is what it is.
Vice President of the I-Hate-Lefties-Club (Founded by Del Ballard Jr.)