Here's the link to read about these cool little notebooks: www.bokubooks.com click on the products list (apologies for not knowing how to engage the link directly). I discovered them at my local independent bookstore (yay!) and they're wonderful. So far no feathering or bleed through using both fine and medium wet nibs. The cream colored paper is thick and fairly smooth (not Clairefontaine smooth but no tooth such as laid paper either).
I plan on grabbing a few more in various sizes. Check to see if your city has a store where you can check them out. The on-line link in the Where to Buy section (Global Exchange Online) doesn't seem to be working right now so you may want to email them if you are very interested. Enjoy!