We have used a lot of Bamboo over the years, and it is a smooth draw material.About 3 fps slower than Maple or foam cores.In hot humid areas, bamboo is the worst for drawing moisture and coming apart, any wood core is next. Foam cores have pretty much eleminate this problem. Foam cores with Fiberglass with cat whiskers is one of the quietest limbs I've shot. Carbon is or should be used more for the stability than for speed, we only gain 2-4 fps with foam. Our Max1 limbs can only be made with carbon, fiberglass is just not stable enough for our limb design.