Heavy looking in the sense that the inner circle is wide- not that the element is thick. The aperture is too small and the width of the doughnut cuts out a lot of light- compared to the acrylic element on my match rifle. I’m guessing the small tunnel of the hw30 also reduces light-so a bigger tunnel with an acrylic element would be better-also can then start big with the aperture and get smaller as she improves? Having said all that, I’ve already spent 130 on the rifle and 50 on the diopter, so looking for a reasonably budget solution!