lets see the arrows are 27 1/2 inches long and I can't for the life of me remember the brand. However they shot fine with the HCA at 70 lbs, I do remember getting them spined for 70 lbs and 27 1/2 inches. I do not shoot loops I have the knocking point doubled up, two brass knocks for no slippage. I have noticed some fish tailing in my shots "I THINK". Also I double checked the Muzzy Zero tonight and notice the stop screw was not hitting the stop plate. I have re-tightened all the screws bit can;t figure out why a lower shot when I raised the draw weight. My draw lenght is 29" and at the current time I am not using a stabalizer, but plan on getting one by tuesday afternoon.