QUALITY MATERIAL: The shock absorption pads are made of high quality rubber, high hardness, good toughness, more stable. EASY INSTALLATION: The anti-vibration base is easy to install, with enhanced load-bearing capacity and stable and safe structure. Just insert the screws into the holes of the air conditioner feet and tighten the nuts. You can use the pads inside balconies or roofs even on sidewalks and it doesn't look bulky at all. Isolates vibration transmission and reduces low-frequency noise caused by vibration.