The grid lines are only on the front of each sheet. The back is completely blank, which can be great if you want something with zero lining. Since there isn't much show-through on this paper, you can easily use both sides of the page without issues.
I've tried every pen I own on this paper over the years. It handles most things with ease. Aside from brush pens, some pigment markers, and really large, wet nibs, I've never had any problems with this paper. Lines are crisp, dark, dry as expected, and hardly show through on the back side. I haven't noticed any feathering or bleeding with the many inks/pens I've used. There's a light coating on the paper that makes it feel smoother when writing (it feels great, by the way), but it doesn't seem to affect dry time much at all. Perfect balance.
Let's look at the unique aspect of this notebook: the size. The US Letter size is a limited edition for the US market, and for now, only available on Amazon. It measures in at 279 x 226 mm, or 11 x 8.9 in. When you tear out a sheet, it measures 8.5 x 11 exactly, so the extra 0.4 accounts for the binding.
Alright, cool. It's a notebook from Japan that uses a US letter size for the pages. This isn't common, which is why it feels a little weird. Also, it's a USA limited edition, so all I can do is scratch my head and wonder why. I already have an A4 version of this notebook, and you can't tell which is which unless you compare them to each other. I'm a little perplexed why Maruman would set up the machines to run a limited edition notebook size for the US market, but here we are! If you want this special Letter size notebook, you have to pick them up from Maruman directly on Amazon.
Regardless of what size you pick, rest assured that this will be a fantastic notebook with paper that is really nice to use.
(Maruman provided this product at no charge to The Pen Addict for review purposes.)