A decorative effect produced by fusing several layers of sterling silver and copper together. This technique is referred to as the ‘Mokume-gane’ technique, and the sandwich of alloys is called a ‘billet’. The process can be made into thin sheets up to 0.25 mm. Pressing the hot billet with a hydraulic press makes them stronger and mitigates breakage. The material is sold in sheets from 250 g–350 g (8.82 oz–12.35 oz), with a minimum sheet size of 10 mm x 10 mm (0.39 in x 0.39 in) and a maximum sheet size of 6 mm x 300 mm (3.00 in x 11.81 in). Other metals, such as 18K white gold, 18K yellow gold, and 18K pink gold, can be fused using this technique. Applications include jewelry and interior design.