Relacionar Columnas MaterialesVersión en línea Materiales de las máquinas por ANDREA CAMARA 1 2 3 4 5 6 7 8 The pegs are made of plastic. The peg is made of wood. The pulley is made of metal. The lamp is made of metal. The computer is made of glass. The book is made of paper. The sharpener is made of metal. The sharpener is made of plastic.