What is the best material for surfboard blanks

Hi guys,

I want the feed the CNC for making a nice surfboard shape. What core material would you recommend?
I’ve heard that XPS is quite a good option:


Any better options?

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Austrotherm or Jackodur are very similar.

5 lb or 8 lb foam works great. I’ve made a few boards. 2 lb foam works OK too, but it’ll dent easy.

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