Profile: Nabell USA Corporation is a manufacturer of bellows and protective covers for a variety of applications. Our welded round polyurethane bellows are made from polyurethane sheets that are stacked on top of each other and welded around the inner & outer perimeters. Our radio frequency bellows offer the compression ratios of any of our standard round bellows. These bellows are made from polyurethane. These bellows are completely sealed and offer liquid-tight protection of the equipment. Our RF welded bellows come in a wide variety of sizes with standard sleeve or flange ends. The RF welded bellows are very well suited for clean room applications where low particle generation is important.