Refractory, CRM, Fireclay, set of 10 x 20 g (1 x 20 g each of JRRM-101, JRRM-102, JRRM-103, JRRM-104, JRRM-105a, JRRM-106, JRRM-107, JRRM-108, JRRM-109 and JRRM-110), Powder