Features: This product is a 4-piece set designed to enhance sound performance in different environments. It is compatible with 6.25U and 7U space bar keycap internal filling to improve the sound quality of the space cavity. Each set includes 4 pieces, suitable for use on satellite keyboard layouts. It can also be used with steel plate satellite shafts or balanced mechanisms, allowing for DIY customization and trimming. The product comes with adhesive backing; use tweezers to gently remove the adhesive film to avoid separation issues. Specifications: Component: Cotton Length: Approximately 9cm (3.54in) for 6.25U; 12cm (4.72in) for 7U Package Includes: 1 set of sound insulation foam (4 pieces) Optional for: 6.25U / 7U Note: The product does not include a space bar. Due to lighting effects, there may be slight color variations. Please allow 0–1cm measurement deviation due to manual measurement.