They are called miniatures. They are either pewter or plastic painted with acryllics. That old lady is made of kiln fired porcelain and enamel!

PS. The multi-melta is a terminator destroying machine. Physical armour save totally negated! The problem is its so short range that if you miss you'll get savaged the next turn. You're probably better off with a lascannon. Such is the darkness of the future... there is only war.