Genuine Joe® Heavyweight Plastic Knives Heavy/medium-weight knives are rigid and flexible. Made of white polystyrene. facilitates a . . Genuine Joe® Disposable Plastic Knives, Heavyweight, Polystyrene, White, Color: White Quantity per selling unit: 100 Knives Recycled? : N Material: Polystyrene Construction: Heavyweight Use in breakrooms and events Heavyweight construction Rigid, flexible design for dependable use Disposable for easy cleanup Polystyrene material White color 100 Knives per box Authentic Genuine Joe® Cutlery Genuine Genuine Joe® 30-Day Hassle-Free Return