They are the cast resin knobs. I just got back in from shooting it and she screams. I set the brace hgt at 7 3/4" and was shooting a 2216 Easton shaft. I will get string silencers on it this afternoon, she's a little loud right now. I have a feeling the whitetail in the area are in big trouble. I think the charcoal riser looks elegant. The picture does not do the flatgrain zebrawood justice on the limbs. I initially thought that they would come out lighter but am ecstatic that they have that hint of darkness. The bad thing about this thread is I am already considering ordering another Tip w/charcoal riser but with snakeskin limbs.