- Heavy Weight Black Plastic Knives by Crystalware Enjoy any festivity with these disposable, reusable and very durable plastic forks. Great for weddings, picnics, parties, BBQ’s, luncheons, camping or home use. Excellent rigidity makes it ideal for foods you wouldn’t normally eat with plastic, such as chicken and steak. Made of bent resistant polystyrene and excellent grip design for your comfort.