The development aims to create a secret bottle cap media for the fine motor skills of 4-5-year-old children at RA Mambaul Ulum. The research subjects consist of 35 children in group A at RA Mambaul Ulum. The data collection techniques used in this study include observation by the researcher, interviews with classroom teachers, validation questionnaires from media and learning experts, as well as questionnaires for teacher and student responses. Documentation of children's learning activities in the form of photographs was also carried out. The data analysis techniques used in this study are quantitative and qualitative. The results of the research show a significant improvement in the development of fine motor skills in children. The research and development of the secret bottle cap media obtained a percentage of 87.5% based on the assessment of media experts, 85.7% based on the assessment of learning experts, 91.7% based on the assessment of teachers' responses, 82.5% based on observation scores from small group tests conducted with students, and 84% based on observation scores from field tests with students. Therefore, the secret bottle cap media can be categorized as highly suitable for 4-5-year-olds (group A).

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