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