"Ball transfer units are omni-directional load-bearing spherical balls mounted inside a restraining fixture. They are identical in principle to a ball computer mouse upside-down, or a trackball, except there is an array of them side-by-side. Typically the design involves a single large ball supported by smaller ball bearings." ( http://en.wikipedia.org/wiki/Ball_transfer_unit )

"Ca si particularitate, bilele de transfer asigura o miscare in toate directiile permitand transferul de sarcini mici si/sau mari, oferind totodata posibilitatea unei schimbari bruste de directie.

Bilele de transfer au aplicabilitate in mai toate domeniile industriei, fie ca sunt folosite la incarcarea sau descarcarea anumitor marfuri, la mutarea(transferul) anumitor materii prime si/sau materiale, sau chiar in diverse asamblari ce permit miscarea liniara." ( http://www.rulmentipitesti.ro/article.php?articleId=52 )