Features: This product is a four-piece set suitable for improving the effect in different environments. 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 composed- of four components, which can be easily used on the keyboard of the pcb- satellite axis- It can also be adapted to the use of steel plate satellite shafts or balance bars through DIY tailoring. The product comes with adhesive backing, please use tweezers to gently remove the adhesive film to avoid no easy separation. for Cherry-, DSA-, OEM and other height keycaps can be used. Specifications: Material: Cotton Package Size: approx 8x5x2cm/3.15x1.97x0.79in include:4pcs Space sound insulation cotton Optional Package for: 6.25U / 7U Package Includes: 1 Set Sound Insulation Foam note: Note: The product does not contain a space bar. Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.