I started out with Flu Flu style sea gull feathers and i have used 4 inch feathers with the weight of the heads i use the arrows dipped too much, i am using 5 inch feathers now, and the 125 grain heads and the 125 grain glue in/ glue on adapters they work fine, i have a string with fur silencers, my bows a 60 lb at 28 draw and it fires like a shot from a rifle, in a split second it hits i dont think it makes much noise, im going to shoot it in the silence of the woods this summer and find out tho