Let me begin with my conclusion: the PE-06 case is perfect for a small number of pens and pencils. I'm jealous of my son's acquisition.
So this thing is a clam shell design, and it appears to be made of nylon. A cool feature (shown in the first picture above) is the zippered pocket on the front of the case, which gives quick access to frequently-used items. The end of this front pocket has a mesh "window" so that you can see which pens/pencils are tucked away there - pretty cool design feature. Open the PE-06 to reveal the two halves of the main compartment:
I'm not feeling the bright orange color of the interior, but I can appreciate the "stylistic philosophy" driving the use of contrasting colors. The inside has a variety of slots and pockets of different shapes and sizes. The Japanese are so thoughtful: the PE-06 comes with detailed instructions and a diagram that shows where you can put things:
There really is a lot of room in the main compartment, enough to store more pens than I would ever need to carry around. It's nearly perfect for my son's use as a school case that usually stays at his desk (but occasionally comes home with him). I think it would be nice to have a pocket or some slots lined with soft material, but that's getting nit picky. My son likes it, so it was a successful acquisition. Here's one more picture that shows the PE-06 in all of its pen-stuffed glory: