Don't have a camera to take the pics inside the tube. The width of the bridge is about 1/3 of the width of the tube. As far as burnout, I got 20 of them with the original PIF co-op order a month+ ago, and I've only used 3 - one for my Chuck, one for my GGTS and one I gave to a buddy. They're all still working. I only use them at 3.7 V, and I alternate with using a cartomizer on my AFS2.0, but so far, so good.