Slot covers are accessories inserted into the slots of aluminum extrusions as covers. By filling aluminum extrusion slots, they prevent dirt or dust from entering and act as a cushioning material. Slot covers made of various materials are available, enabling selection of materials matching the application or objective. For example, slot covers made of the same aluminum as the frame can be selected when an attractive finish or integrated look is the priority. Tight-fitting models made of resin or silicone can be selected when dust-proofing or safety is the priority. There are also sponge-based products that support curving frames, with an extensive lineup of models for different groove widths.