They used to be old Beman Hunters... pultruded shafts, but alas, they are no longer produced. The closest thing to them today are a Cabela's offering... their SST line, a pultruded shaft, wearing a 35 grain outsert, (to facilitate screwing in a broadhead) and a 75 grain Rocket Wolvering 3P mechanical. I opted for the internal nock system for these shafts, which they no longer offer, since the standard nocks slip over the end of the shaft causing a rest impact problem. The discontinued internal nocks are a 2 piece design and allow unobstructed rest passage. I suppose a drop away rest would be the way to go when I run out of the internal nocks I have on hand. These arrows hit like a truck and are really hard to damage, even after sticking smartly in the ground after pass through.