Stonehenge Aqua Cold Press Sketchpad
"Hand-crafted with the watercolorist in mind, this rugged and textured substrate is our latest creation in artisan paper. Each cold-pressed sheet naturally receives applied moisture, making it ideal for blending and lifting color. This is Stonehenge Aqua Coldpress." - What the sketchpad has to say about itself.
This is from the Legion Paper artist line of artisan sketchpads. It is a 7" x 10" pad that contains 15 sheets of premium, 140lbs, 100% cotton, cold-pressed watercolor paper.
This block of paper is glued on all four sides to deter warping when painting in the sketchpad itself. There is a small section that is unglued and this is where you go about removing your art once it's dry.
Here is a video explaining the process.