Material: 100% natural

The ink is oil-based and permanent

though the compact 9 x 14 cm page size limits the complexity of diagrams compared to larger squared formats

It's a transparent acrylic varnish that works on pretty much any surface

clairefontaine sketchbook a3 Zusa Material: 100% naturalA large format spiral bound sketch pad built for studio assignments, life drawing, and broad gestural work. Fifty sheets of light grained 90 g m white paper with just enough tooth to grip graphite, charcoal, and dry pastels cleanly. The top wire O twin ring binding opens completely flat and folds back on itself for a rigid self supporting workspace. Micro perforated sheets tear away cleanly without fringe. Acid free, pH neutral. Format: A3 50 micro