dood, the guy said the carbon with aluminum ends transferred the shock to his frrame resulting in damage to the frame and all they did was slide. so you may get more damage to your bike if you have metal sliders than if you dont have any at all, they can break your engine mounts off, thats why the "nylon" sliders are the best, they will actually bend around the bolt before they break the mount points, plus they act as a break to slow you bike down if it slides on them....no brainer'