What size do you usually choose for marble stair boards

The size of marble stair treads can vary depending on the specific project and design preferences. Tuttavia, common sizes for marble stair treads are typically 12 inches (30 cm) deep and 36 to 48 inches (90 to 120 cm) wide. The thickness of the stair treads can also vary, but is typically around 1.25 inches (3 cm) for residential projects and 2 inches (5 cm) or more for commercial projects. The size of the stair treads should be customized to fit the specific dimensions of the staircase and the design goals of the project.