ROLLED STOCK
Refers to standardised lengths of profiles (end shapes) or plate metal (sheets). The metal has been rolled in certain ways to form these. This gives it extra strength and compression – removing imperfections.
Common available profiles: round, square, tube, box, rectangular, hexagonal, angle, unequal angle.
CAST METAL
Two-part casting: generally for simpler patterns, but a good knowledge of casting can allow very complicated shapes. The pattern is packed into sand, then split, and the pattern is removed and cast. To allow the pattern to come out, it requires relief angles or tapers on the surfaces (that are perpendicular to the split surface).
Lost wax: a mould is made out of a silicone, and then wax is poured into the
mould. Bronze is poured through melting wax. You can have more intricate shapes, and don’t have to worry about undercuts and tapers. More expensive.