Mushonga wekemikari yemabhero anoyangarara inonyanya kuve silicon dioxide uye aluminium oxide.Iine akawanda hunhu senge akatsetseka zvimedu, hollow, huremu huremu, simba rakawanda, kupfeka kuramba, kupisa kwekushisa kwakanyanya, kupisa kwemafuta uye kudzoreredza moto.Inoshandiswa zvakanyanya muImwe yezvigadzirwa zveiyo refractory indasitiri.