''Bows in this period are classed as self-bows, being the Viking Age were made from a single piece of D ‘D’ section wood, usually yew. Nocks are cut straight into the wood.'' if available [HALPIN 2008: p.40-41](Dublin, Hedeby, Wassenaar), but elm (Dublin, Hedeby) and even scots pine (Dublin) were also used. Bow varied in strength up to around 100lbs (Hedeby). <br>Bows were made by working down a wooden stave so that the heartwood formed the bulk of the bow, giving it its strength, while a layer of sapwood was retained along the bow’s back to give the bow more elasticity under tension and to help prevent it from breaking. <br>Many of the bows were extremely simple and we have a number of finds of bows that still have the bumps and branch accretions left from the removed branches along their backs (Wassenaar, Hedeby). <br>
