Gray bands with thick red bands are referred to as Blairs Phase, those specimens lacking red or with very little red, like yours are referred to as Alterna phase.

"Sanderson" does not refer a phase, but rather a location where an animal or the original breeding stock of an animal was found.

I am assuming that you do not have locality information on your animal, so it would be considered a generic alterna phase Gray banded kingsnake.

Nice looking animal.. Good Luck with him!

~ Mike Russo

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