Natural Gas Services Group, Inc. is a provider of natural gas compression equipment, technology, and services to the energy industry. The Company rents, operates and maintains natural gas compressors for oil and gas production and processing facilities. In addition, the Company designs and assembles compressor units for rental to its customers and provides aftermarket services in the form of call-out services on customer-owned equipment, as well as commissioning of new units for customers. Its rental compression units provide large, medium and small horsepower applications for conventional and unconventional oil and gas production. It also provides an exchange and rebuilds program for small horsepower screw compressors and maintains an inventory of new and used compressors to facilitate this part of its business. It has approximately 1,912 natural gas compressors in its rental fleet, totaling 598,840 horsepower.