The UltraLite® UC1838-3 is a lightweight concrete composite equipment pad designed to support HVAC condensers, heat pumps, and other outdoor equipment. UltraLite® is strengthened by miles of fiber in each square foot of fiber-cement coating which also provides excellent resistance to cracking or breaking. The concrete outer skin and EPS foam inner core provide flexibility and vibration dampening. The solid bottom provides excellent resistance to settling. Diversitech UltraLite® Concrete Equipment Pad, Lightweight, 38 in Length, 18 in Width, 3 in Height, For Use With: Air-Conditioning Compressor and Condensing Unit, Gray, Domestic