Chalgren Enterprises' reusable bar electrodes are available with tin plated concave 9 mm discs or stainless stee convex discs with a 30 mm spacing. They are available in a 24" or 48" PVC insulated red and black twisted leadwire ending with standard touch proof connectors. A concave version is available with a 36" PVC insulated shielded leadwire. The bar is made of clear polycarbonate.