Refractory, CRM, Zircon-Zirconia, set of 10 x 20 g (1 x 20 g each of JRRM-601, JRRM-602, JRRM-603, JRRM-604, JRRM-605, JRRM-606, JRRM-607, JRRM-608, JRRM-609 and JRRM-610), Powder