hey guys, just recieved some BEAUTIFU arrow shafts from Bill of Allegheny Mountain Arrowwoods! They are 5/16" diameter Hickory parallel shafts and spined in the 55-60 pound range...just perfect for my 51# Holcomb 59er.The small diameter to weight ratio is excellent and they should penetrate all day long....lots of weight to those hickory shafts, considering their small cross section! For me, It's not all about speed, but more about penetration! However, make no mistake about it, they are faster than the normal 500-550 grain tapered 11/32" ash shafts I generally shoot, and tough as nails...I love these!...you wood shooters...check these out!...jackdaw