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 Return Policy: 30-Days Features: Heavy-Duty Assembled Product Dimensions (L x W x H): 7.15 x 4.32 x 2.15 Inches