This quick and dirty primer on the most common types of pallet racks will help you determine which type is best suited to a particular application. 1. SELECTIVE RACK If you're mentally picturing a rack right now, chances are you're imagining a selective rack. Featuring the most basic of designs—two upright frames and shelf beams placed between them. Walk into just about any distribution center or warehouse, and you're likely to see selective racking somewhere in the facility.