THICK AND STURDY - Made of very good quality 160gsm thick paper, a3 hardback sketchbook comes with lovely thick front. The hard cover allows you to keep the sheets well protected and not to make them wrinkle in the bag. The covers also provide excellent protection for your art. QUICK USER TIPS - The cartridge paper can hold paint only if it is lightly applied. It is more designed for use with dry-based materials rather than paints or watercolours, so it would depend on your intended use. It's great for practising and experimenting with brush techniques before you apply them to a watercolour. CONVENIENT TO USE - Comes with 3 pcs a3 spiral bound sketchbook, which features a convenient spiral binding design, it can be easily opened and closed on the short side. It is very convenient to use, which is an ideal sketching pad, and drawing exercise pad. PROFESSIONAL ARTIST PAPER - The a3 sketch pad paper is strong and smooth, effectively absorbing colors and reducing spots or bleeding, which matches with most media such as charcoal, watercolor, acrylic paint, etc., great for sketching, drawing, cartoons, still life, stippling, and practising new painting techniques.