Knife Refill Cartridge Is Designed For Use In Gp Pro Ultra Smartstock Tri-Tower Cutlery Dispenser. Pre-Counted, Pre-Assembled Refill Makes It Fast And Easy To Restock An Empty Dispenser. Simply Pick Up A New Series-T Cutlery Refill, Slide It Into The Dispenser, Grasp The Pull Tab, Pull Away The Paper Band And Close The Door. Knives Are Made Of Polystyrene.