Winsor & Newton hard back sketch books contain 48 perforated leaves of 170gsm acid-free cartridge paper.
Available in different sizes in Hard Back Wire-O and Hard Back glued edge (perfect bound) format.
Winsor & Newton occasionally produce a less-than-stellar product. Their hard back sketchbook is unfortunately in that category. The paper used has a slick to shiny finish reminiscent of glossy magazine paper. It does not take pencil, Conté crayon or colored pencil well. Fountain pen ink beads on the surface, delaying dry time, and making it very prone to smearing. And the binding is not rectilinear, and the outer hard cover is only partially connected with the bulk of sketch paper. Not recommended. Jon Fabian (Maryland, USA) on 28 Sep 2014
Love this size of sketchbook (A5), small enough to tuck away in a bag. The 170 gsm paper is heavy enough to take a light watercolour wash - my sketching kit has one of these books, a Pitt pen, a couple of Pentel aquabrushes and a small W&N watercolour box of half pans. Perfect. Sharon Williamson (St. Neots, United Kingdom) on 9 Mar 2013
The binding is awful, the pages come off as soon as you turn them. I ordered two and both have this problem, so I doubt it's a one-time thing.
The paper quality seems fine, but since every page I've used so far has just come loose I might as well have bought a stack of loose pages.
I can't speak for the quality of the ring-bound ones, but definitely avoid the hardback ones. J. (Spain) on 30 Jun 2014