Lyman 1-Cavity Bullet Molds are made from solid leaded-steel and machined to an exact and smooth super fine finish. The molds are then heat treated (that is why they are blue in color) and feature hardened steel alignment pins to provide many years of bullet casting service. Sprue plates are made from solid steel, ground flat and held tightly in place with tempered steel spring washers and screws. In addition, break-in is often half the time required for iron molds. Requires large mold handles which are not included. Round ball molds will cast perfect balls with a minimum sprue to ensure the kind of accuracy that target shooters have come to expect from Lyman molds. Notes: Hardwood Handles are not included and must be purchased separately. For Lyman molds please order MidwayUSA product # 698-819Weight given are Lyman's weights with suggested alloy; actual weight may vary due to alloy mixture used.