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