The miniatures are cast in white metal, which is an alloy of several metals, but mostly lead and tin.
The terrain pieces are cast in polyurethane resin.
With both metal miniatures and resin pieces, it is advisable to wear a dust filter when sanding or filing, and ensure any dust residue is cleaned up thoroughly. When handling unpainted miniatures, it is recommended that you wash your hands afterwards.
Both metal and resin models should be primed with an acrylic primer before painting. Resin parts should be washed in warm soapy water first to remove any lingering mould-release residue.
They are not toys, and are not intended for children.