The purpose of the current study was to investigate the effect of micro-teaching practices with concrete models on the pre-service teachers' self-efficacy beliefs about using concrete models and to determine the opinions of the pre-service teachers about this issue. In the current study, one of the mixed methods, the convergent design (embedded) was used. The participants in the study consisted of 41 pre-service elementary mathematics teachers who were enrolled mathematics teacher education programme at a state university in Turkey. In this research, The Instrument of Pre-service Mathematics Teachers Efficacy Beliefs about Using Concrete Models developed by Bakkaloglu and interview forms were used as data collection tools. The research revealed that the micro-teaching practices with concrete models had positive effects on the pre-service teachers' self-efficacy beliefs about using concrete models. Pre-service teachers think that these micro-teaching practices had positive effects on the skills of teaching.