Refractory, CRM, Alumina-Magnesia, set of 10 x 20 g (1 x 20 g each of JRRM-801, JRRM-802, JRRM-803, JRRM-804, JRRM-805, JRRM-806, JRRM-807, JRRM-808, JRRM-809 and JRRM-810), Powder