In order to get a better inner quality of continuously cast steel slabs, ceramic sprayed roll technique as an insulated material has been developed to increase the slab thermo-mechanical rigidity against the thermo-mechanical stresses between a pair of rolls. The idea behind this technique is increasing in the slab solid shell resistance "Ic" by optimizing the homogeneity of cooling conditions between a pair of rolls. This is by minimizing a rapid fluctuation in the surface temperature especially at roll contact area. The mathematical model of thermal, solidification, solid shell resistance and cooling conditions has been developed. The model predications indicate that the increasing in the thickness "c" of this layer or decreasing its thermal conductivity "c" is proportional to decreasing the peak of surface temperature at roll contact area. The predictions also point out that the improving of the solid shell resistance depends on the optimum selection of c and c with cooling conditions between rolls. Also, the predications were used to explain and discussed the mechanism of ceramic layer characteristics with Ic and thermo-mechanical rigidity of steel slab.