The one, and only Bamboo backed Ipe bow that I made was 3 piece take down , 40 lbs. at 26 inches draw with straight limbs. It is 1 1/4 at the fades to 1/2 inch at the tips. When I first built it I shot it a lot. Now, not so much.The Bamboo back was thin so I had more Ipe than Bamboo for thickness.