Originally posted by northener: I'am sorry, I did not explain this very good.The Bamboo core is an upgrade. The Bowyers std limb cores are Red elm,Yew and osage. So if I wanted bamboo cores the Yew would be a veneer which also costs extra.Yes I'am real excited to get this bow. I know the bowyer will do a fantastic job. I have 4 others from this bowyer. Always very satified!