I played around with carbons for years trying to get the weight up. Tried weight tubes, weedeater iine....name it, I tried it. The weight tubes can be noisy and are notorious for popping nocks out on impact. Weedeater line can be noisy, as well and is really just another form of weight tube. One day on another site I read about Bob Morrison shooting heavy arrows...some with tubes, some with heavy points. The heavy points were superior in penetration tests he was doing. I tried it and it worked...never looked back. I now have my 10 gpi arrows that penetrate extremely well and my nocks stay where they are supposed to, no noise and my arrows appear to be more stable and consistent.