The AP36 C-Port Air-Port 36" X 5" Utility Pad is Made from 100% Recycled Rubber and Designed as a Non-Penetrating, Economical and Light-Weight Support Safe for Installation on any Type of Roofing Material or other Flat Surface. A Grooved, Recessed Tray Design Prevents Movement and Dampens Vibration while Providing a Solid Support for all Electrical and HVAC Equipment. The Propietary Free-Flow Leg System Allows for Easy Water Passage Beneath the Equipment Inhibiting the Growth of Harmful Moss and Mould. The UV Resistant Air-Port is the Perfect Long-Lasting Alternative to Roof-Damaging Heavy Concrete Curbing and Pressure-Treated Wood Blocks