Wire - Square - Half Hard - Sterling SilverSquare Sterling Silver Wire that is Half hard. Square wire lets you be creative by letting you play with texture and shape in your designs. Half Hard Wire has been hardened but is still very malleable. Because it has been hardened, half hard wire will maintain a loop, bend or shape under some stress. Half Hard Wire is commonly used when making wire wrapped jewellery or simple loops. 20ga (15ft) 4. 57m, 22ga (24ft) 7. 31m