Features: This product is a 4pcs set suitable for improving the effect in different environment. This product is suitable for 6.25U/ 7U space bar keycap internal filling to improve the sound effect of the space cavity. Each set of goods is of 4pcs, which can be easily used on the keyboard of the satellite. It can also to the use of steel plate satellite shafts or balance through DIY tailoring. The product comes with adhesive backing, please use tweezers to gently remove the adhesive film to avoid no easy separation. Specifications: Component: Cotton Length：about 9cm/3.54in 6.25U； 12cm/4.72in 7U include:4pcs Space sound insulation cotton Optional Package for: 6.25U / 7U Package Includes: 1 Set Sound Insulation Foam note: Note: The product not contain a space bar. Due to the problems of lighting effects, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.