The 1 x 4 x 1 1/3 brick (Part 6191) features a smooth, studless curved top. Measuring one and one-third bricks in height, it is frequently used to create seamless arches, rounded vehicle roofs, and architectural curves. This part provides a clean, finished aesthetic for builds requiring rounded edges without exposed studs. It is a specialized element for adding subtle height and curvature to structural designs.

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LEGO® parts are intended for builders aged 4 and up. They may pose a choking hazard for children under 3 years old.