The features of these palm sanders are:
Built In Regulator for Speed Control 
Low Vibration, Light Weight and Ergonomic Design
3/16" (4.8mm) Orbit Pattern
Uses Hook and Loop Sanding Disks
Ideal for Producing Fine Finishes
Has a Rear Exhaust
The Orbit Sander has the following Specifications:
Free Speed: 9,000 RPM 
Sanding Pad Size: 6"
Air Inlet: 1/4" BSP or NPT
Air Hose (ID): 3/8"