My portable watercolour sketchbooks are bound in a soft cover made of upcycled leather. Their pages are off white 190gsm Saunders Waterford 100% cotton paper produced by St. Cuthberts Mill in the UK. The books have torn edges with an occasional watermark visible in some pages. Each book in this series has an antiqued metal ring on its back so they can be attached to a cord and connected together or used as a pendant.