Striper Silicone Pastry Bag 13 Inch by Fat Daddio's. Manufactured from FDA good grade silicone, these pastry bags are seamless, extremely durable, and 100% dishwasher safe. The silicone material will not stain, absorb flavors, or tear. These bags feature a seal down the inside center of the bag allowing for 2 different colors to be used, giving your icing a striped look. Each bag is individually packaged and comes with complete care and use instructions.