rounded square tag 3d model

A small minimalist rounded square tag, 38 mm wide, 38 mm deep, 7 mm thick, corner radius 8 mm on all four corners, like a smooth flat river pebble cut into a square. The top face is flat and smooth with a soft 1 mm chamfer where it meets the side walls. The side walls are vertical with a fine sandstone grain texture. A thin shallow groove, 0.8 mm wide and 0.8 mm deep, runs continuously around the entire outer edge at exactly mid-height, dividing the object visually into an upper and lower half. Centered on the top face is a single debossed mark engraved 0.5 mm deep: a small solid circle, 5 mm diameter, resting on top of a short horizontal line 18 mm long and 1.4 mm thick, so the circle touches the line like a ball sitting on the ground. The bottom face is completely flat. Material is warm light grey matte soft-touch plastic, slightly desaturated, non-reflective. Single solid object, no text, no letters, no buttons, no screen, no seams, no screws, no cables.